Statistics - Mean
Question 1
To calculate the mean, add up all the numbers, and divide by how many there are.
Find the mean of the following (non calculator):
a) $2,3,7$
a
$4$
Question ID: 70020010010
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The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=2+3+7=12$
There are $3$ numbers.
So the mean $={12}\div{3}=4$
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b) $1,4,7,8$
a
$5$
Question ID: 70020010020
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The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=1+4+7+8=20$
There are $4$ numbers.
So the mean $={20}\div{4}=5$
Question ID: 70020010020
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c) $4,8,11,12,15$
a
$10$
Question ID: 70020010030
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The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=4+8+11+12+15=50$
There are $5$ numbers.
So the mean $={50}\div{5}=10$
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d) $8,2,6,8$
a
$6$
Question ID: 70020010040
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The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=8+2+6+8=24$
Order does not matter.
There are $4$ numbers.
So the mean $={24}\div{4}=6$
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e) $11,2,14,5$
a
$8$
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The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=11+2+14+5=32$
Order does not matter.
There are $4$ numbers.
So the mean $={32}\div{4}=8$
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f) $2,3,4,5,6$
a
$4$
Question ID: 70020010060
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The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=2+3+4+5+6=20$
There are $5$ numbers.
So the mean $={20}\div{5}=4$
You may also see that either side of $4$, $2$ and $6$ are equally far away and $3$ and $5$ are equally far away so they cancel out to make $4$ the mean.
Question ID: 70020010060
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g) $9,5,7,3,6,8,4$
a
$6$
Question ID: 70020010070
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The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=9+5+7+3+6+8+4=42$
Order does not matter.
There are $7$ numbers.
So the mean $={42}\div{7}=6$
You may also want to put the numbers in order.
$3,4,5,6,7,8,9$
You may see that either side of $6$, $5$ and $7$ are equally far away, likewise for the others, so they cancel out to make $6$ the mean without further calculation needed.
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h) $8,12,4,17,4$
a
$9$
Question ID: 70020010080
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The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=8+12+4+17+4=45$
Order does not matter.
There are $5$ numbers.
So the mean $={45}\div{5}=9$
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i) $18,1,17,14,6,2$
a
$13$
Question ID: 70020010090
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The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $18+1+17+14+6+2=78$,
Order does not matter.
There are $6$ numbers.
So the mean $={78}\div{6}=13$
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j) $101,102,105,108$
a
$104$
Question ID: 70020010100
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The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=101+102+105+108=416$,
There are $4$ numbers.
So the mean $={416}\div{4}=104$
Question ID: 70020010100
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k) $5,6$
a
$5.5$
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The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=5+6=11$,
There are $2$ numbers.
So the mean $={11}\div{2}=5.5$
The mean can be any number, including a decimal.
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l) $7,9,9,4$
a
$7.25$ or $7\frac14$
Question ID: 70020010120
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The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=7+9+9+4=29$,
Order does not matter.
There are $4$ numbers.
So the mean $={29}\div{4}=7r1=7.25$ or $7\frac14$
Question ID: 70020010120
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m) $13,2,7,18,3$
a
$8.6$
Question ID: 70020010130
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The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $13+2+7+18+3=43$
Order does not matter.
There are $5$ numbers.
So the mean $=\frac{43}{5}=8\frac35$ or $8.6$
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n) $18,97,14,11$
a
$35$
Question ID: 70020010140
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The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=18+97+14+11=140$
Order does not matter.
There are $4$ numbers.
So the mean $=\frac{140}{4}=\frac{70}{2}=35$
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o) $64,14,43,11,72$
a
$40\frac{4}{5}$ or $40.8$
Question ID: 70020010150
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The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=64+14+43+11+72=204$
Order does not matter.
There are $5$ numbers.
So the mean $=\frac{204}{5}=40\frac{4}{5}$ or $40.8$
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Question 2
Find the mean of the following (calculator):
a) $14,17,22,44$
a
$24.25$
Question ID: 70020020010
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b) $35,5,36,22,15$
a
$22.6$
Question ID: 70020020020
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c) $47,12,94,24,1,56$
a
$39$
Question ID: 70020020030
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d) $3,3,3,3,3,5,5,5,5,5$
a
$4$
Question ID: 70020020040
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e) $131,166,131,155,201,59$
a
$140.5$
Question ID: 70020020050
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f) $22.4,55.9,18.5,24.3$
a
$30.275$
Question ID: 70020020060
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g) $101.4,55.8,23.7,187.3,11.2,400$
a
$129.9$
Question ID: 70020020070
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h) $323.9,523.11,53.4,911.54,75.5,322.74,632.55,233.76$
a
$384.5625$
Question ID: 70020020080
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i) $3146,414,5317,1432,8794,1342,5237,2381,1235,548,587,4892$
a
$2943.75$
Question ID: 70020020090
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Question 3
Answer the following worded questions:
a) I ate the following servings of fruit in a week:
$3,4,3,5,2,0,4$
What was the mean amount of fruit I ate each day?
a
Each day I ate a mean of $3$ pieces of fruit. That's not enough!
Question ID: 70020030010
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b) Over a season I scored the following in matches:
$4,7,2,4,6,2,5,2$
What is my mean score?
a
My mean score is $4$
Question ID: 70020030020
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c) What is the mean of the following prices?
$\$2.50,\$4.25,\$3.75,\$8,\$1.50$
a
The mean price is $\$4$
Question ID: 70020030030
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d) Sam has $10$ friends at his birthday. Their ages are:
$12,12,13,12,13,12,10,13,12,11$
What is their mean age?
a
Their mean age is $12$
Question ID: 70020030040
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e) The hourly wage of $5$ workers at Arms Factory are:
£$8,$£$10,$£$14,$£$11,$£$13$
The hourly wage of $6$ workers at Bran Factory are:
£$7,$£$13,$£$14,$£$10,$£$9,$£$10$
Which factory has a higher mean wage and by how much?
a
Factorys Arms has a higher mean wage by $70$ pence or £$0.70$
Question ID: 70020030050
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Question 4
Find the missing piece of data in each of the following if their mean is $10$.
a) $9,\square,11$
a
$10$
Question ID: 70020040010
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b) $6,\square$
a
$14$
Question ID: 70020040020
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c) $\square,16,2$
a
$12$
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d) $25,\square,3,8,20,1$
a
$3$
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e) $4,5,6,7,8,9,\square,$
a
$21$
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Question 5
Find the missing piece of data in each of the following if their mean is $12$.
a) $12,\square,13$
a
$11$
Question ID: 70020050010
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b) $0,\square$
a
$24$
Question ID: 70020050020
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c) $15,16,13,\square,15$
a
$1$
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d) $13.5,\square,12.5,18.5,5.5,7.5$
a
$14.5$
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Question 6
Find the missing piece of data in each of the following if their mean is $6.6$.
a) $\square,6.6$
a
$6.6$
Question ID: 70020060010
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b) $\square,10,3$
a
$6.8$
Question ID: 70020060020
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c) $0,8.4,\square,4.2,10$
a
$10.4$
Question ID: 70020060030
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d) $6.75,\square,2.2,8.25,9.8,16,0.5$
a
$2.7$
Question ID: 70020060040
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Question 7
Find the mean of the following data set:
a)
Result |
Frequency |
9 |
1 |
10 |
3 |
11 |
1 |
12 |
5 |
a
$11$
Question ID: 70020070010
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b)
Result |
Frequency |
25 |
3 |
26 |
4 |
27 |
2 |
28 |
1 |
a
$26.1$
Question ID: 70020070020
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c)
Result |
Frequency |
4 |
8 |
5 |
4 |
6 |
10 |
7 |
1 |
8 |
2 |
a
$5.4$
Question ID: 70020070030
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Question 8
Find the mean of the following (involves negative numbers):
a) $-4,-5,-9$
a
$-6$
Question ID: 70020080010
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b) $-16,-5,-20,-11$
a
$-13$
Question ID: 70020080020
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c) $-2,2$
a
$0$
Question ID: 70020080030
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d) $-4,-2,3,11$
a
$2$
Question ID: 70020080040
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e) $-10,0,15,-4,-6$
a
$-1$
Question ID: 70020080050
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f) $7,-7,8,-8,9,-9$
a
$0$
Question ID: 70020080060
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g) $44,-6,8,-20,15,-35$
a
$1$
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h) $-72,84,22,-16,0,44,50,-204$
a
$-11.5$
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i) $-125,215,-12,61,77,-821,521,22,124,-5,-124,13$
a
$-4.5$
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j) $-5.2,7.3,-33,-3.6,-66,-12.7,22,5.94$
a
$-10.6625$
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Question 9
Find the missing piece of data in each of the following if their mean is $0$.
a) $\square,6$
a
$-6$
Question ID: 70020090010
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b) $12,\square,-1$
a
$-11$
Question ID: 70020090020
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c) $\square,32,-16,8,-4.4$
a
$-19.6$
Question ID: 70020090030
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d) $-6,20,\square,44,-18,-9,0$
a
$-31$
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Question 10
Find the missing piece of data in each of the following if their mean is $-5$.
a) $\square,-2$
a
$-8$
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b) $0,\square$
a
$-10$
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c) $\square,4,8$
a
$-27$
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d) $2,-5,\square,8,-10$
a
$-5$
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e) $0.4,-4.3,\square,-4.5,-6.2,-9$
a
$-6.4$
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Question 11
Answer the following worded questions:
a) Trule Inc. records how its profit over $5$ years:
$\$44,000\quad\$50,000\quad\$12,000\quad\$60,000\quad\$15,000$
What was it's mean annual profit?
a
$\$36,200$
Question ID: 70020110010
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b) Iota Inc. records how its profits/loss over $4$ years:
$\$10,000\quad-\$16,000\quad\$34,000\quad-\$4,000$
Calculate the mean profit/loss over the $4$ years.
a
$\$6,000$ profit
Question ID: 70020110020
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Question 1
To calculate the mean, add up all the numbers, and divide by how many there are.
Find the mean of the following (non calculator):
a) $2,3,7$
b) $1,4,7,8$
c) $4,8,11,12,15$
d) $8,2,6,8$
e) $11,2,14,5$
f) $2,3,4,5,6$
g) $9,5,7,3,6,8,4$
h) $8,12,4,17,4$
i) $18,1,17,14,6,2$
j) $101,102,105,108$
k) $5,6$
l) $7,9,9,4$
m) $13,2,7,18,3$
n) $18,97,14,11$
o) $64,14,43,11,72$
Question 2
Find the mean of the following (calculator):
a) $14,17,22,44$
b) $35,5,36,22,15$
c) $47,12,94,24,1,56$
d) $3,3,3,3,3,5,5,5,5,5$
e) $131,166,131,155,201,59$
f) $22.4,55.9,18.5,24.3$
g) $101.4,55.8,23.7,187.3,11.2,400$
h) $323.9,523.11,53.4,911.54,75.5,322.74,632.55,233.76$
i) $3146,414,5317,1432,8794,1342,5237,2381,1235,548,587,4892$
Question 3
Answer the following worded questions:
a) I ate the following servings of fruit in a week:
$3,4,3,5,2,0,4$
What was the mean amount of fruit I ate each day?
b) Over a season I scored the following in matches:
$4,7,2,4,6,2,5,2$
What is my mean score?
c) What is the mean of the following prices?
$\$2.50,\$4.25,\$3.75,\$8,\$1.50$
d) Sam has $10$ friends at his birthday. Their ages are:
$12,12,13,12,13,12,10,13,12,11$
What is their mean age?
e) The hourly wage of $5$ workers at Arms Factory are:
£$8,$£$10,$£$14,$£$11,$£$13$
The hourly wage of $6$ workers at Bran Factory are:
£$7,$£$13,$£$14,$£$10,$£$9,$£$10$
Which factory has a higher mean wage and by how much?
Question 4
Find the missing piece of data in each of the following if their mean is $10$.
a) $9,\square,11$
b) $6,\square$
c) $\square,16,2$
d) $25,\square,3,8,20,1$
e) $4,5,6,7,8,9,\square,$
Question 5
Find the missing piece of data in each of the following if their mean is $12$.
a) $12,\square,13$
b) $0,\square$
c) $15,16,13,\square,15$
d) $13.5,\square,12.5,18.5,5.5,7.5$
Question 6
Find the missing piece of data in each of the following if their mean is $6.6$.
a) $\square,6.6$
b) $\square,10,3$
c) $0,8.4,\square,4.2,10$
d) $6.75,\square,2.2,8.25,9.8,16,0.5$
Question 7
Find the mean of the following data set:
a)
Result |
Frequency |
9 |
1 |
10 |
3 |
11 |
1 |
12 |
5 |
b)
Result |
Frequency |
25 |
3 |
26 |
4 |
27 |
2 |
28 |
1 |
c)
Result |
Frequency |
4 |
8 |
5 |
4 |
6 |
10 |
7 |
1 |
8 |
2 |
Question 8
Find the mean of the following (involves negative numbers):
a) $-4,-5,-9$
b) $-16,-5,-20,-11$
c) $-2,2$
d) $-4,-2,3,11$
e) $-10,0,15,-4,-6$
f) $7,-7,8,-8,9,-9$
g) $44,-6,8,-20,15,-35$
h) $-72,84,22,-16,0,44,50,-204$
i) $-125,215,-12,61,77,-821,521,22,124,-5,-124,13$
j) $-5.2,7.3,-33,-3.6,-66,-12.7,22,5.94$
Question 9
Find the missing piece of data in each of the following if their mean is $0$.
a) $\square,6$
b) $12,\square,-1$
c) $\square,32,-16,8,-4.4$
d) $-6,20,\square,44,-18,-9,0$
Question 10
Find the missing piece of data in each of the following if their mean is $-5$.
a) $\square,-2$
b) $0,\square$
c) $\square,4,8$
d) $2,-5,\square,8,-10$
e) $0.4,-4.3,\square,-4.5,-6.2,-9$
Question 11
Answer the following worded questions:
a) Trule Inc. records how its profit over $5$ years:
$\$44,000\quad\$50,000\quad\$12,000\quad\$60,000\quad\$15,000$
What was it's mean annual profit?
b) Iota Inc. records how its profits/loss over $4$ years:
$\$10,000\quad-\$16,000\quad\$34,000\quad-\$4,000$
Calculate the mean profit/loss over the $4$ years.
Answers
Question 1
a) $4$
b) $5$
c) $10$
d) $6$
e) $8$
f) $4$
g) $6$
h) $9$
i) $13$
j) $104$
k) $5.5$
l) $7.25$ or $7\frac14$
m) $8.6$
n) $35$
o) $40\frac{4}{5}$ or $40.8$
Question 2
a) $24.25$
b) $22.6$
c) $39$
d) $4$
e) $140.5$
f) $30.275$
g) $129.9$
h) $384.5625$
i) $2943.75$
Question 3
a) Each day I ate a mean of $3$ pieces of fruit. That's not enough!
b) My mean score is $4$
c) The mean price is $\$4$
d) Their mean age is $12$
e) Factorys Arms has a higher mean wage by $70$ pence or £$0.70$
Question 4
a) $10$
b) $14$
c) $12$
d) $3$
e) $21$
Question 5
a) $11$
b) $24$
c) $1$
d) $14.5$
Question 6
a) $6.6$
b) $6.8$
c) $10.4$
d) $2.7$
Question 7
a) $11$
b) $26.1$
c) $5.4$
Question 8
a) $-6$
b) $-13$
c) $0$
d) $2$
e) $-1$
f) $0$
g) $1$
h) $-11.5$
i) $-4.5$
j) $-10.6625$
Question 9
a) $-6$
b) $-11$
c) $-19.6$
d) $-31$
Question 10
a) $-8$
b) $-10$
c) $-27$
d) $-5$
e) $-6.4$
Question 11
a) $\$36,200$
b) $\$6,000$ profit
Question 1
To calculate the mean, add up all the numbers, and divide by how many there are.
Find the mean of the following (non calculator):
a) $2,3,7$
b) $1,4,7,8$
c) $4,8,11,12,15$
d) $8,2,6,8$
e) $11,2,14,5$
f) $2,3,4,5,6$
g) $9,5,7,3,6,8,4$
h) $8,12,4,17,4$
i) $18,1,17,14,6,2$
j) $101,102,105,108$
k) $5,6$
l) $7,9,9,4$
m) $13,2,7,18,3$
n) $18,97,14,11$
o) $64,14,43,11,72$
Question 2
Find the mean of the following (calculator):
a) $14,17,22,44$
b) $35,5,36,22,15$
c) $47,12,94,24,1,56$
d) $3,3,3,3,3,5,5,5,5,5$
e) $131,166,131,155,201,59$
f) $22.4,55.9,18.5,24.3$
g) $101.4,55.8,23.7,187.3,11.2,400$
h) $323.9,523.11,53.4,911.54,75.5,322.74,632.55,233.76$
i) $3146,414,5317,1432,8794,1342,5237,2381,1235,548,587,4892$
Question 3
Answer the following worded questions:
a) I ate the following servings of fruit in a week:
$3,4,3,5,2,0,4$
What was the mean amount of fruit I ate each day?
b) Over a season I scored the following in matches:
$4,7,2,4,6,2,5,2$
What is my mean score?
c) What is the mean of the following prices?
$\$2.50,\$4.25,\$3.75,\$8,\$1.50$
d) Sam has $10$ friends at his birthday. Their ages are:
$12,12,13,12,13,12,10,13,12,11$
What is their mean age?
e) The hourly wage of $5$ workers at Arms Factory are:
£$8,$£$10,$£$14,$£$11,$£$13$
The hourly wage of $6$ workers at Bran Factory are:
£$7,$£$13,$£$14,$£$10,$£$9,$£$10$
Which factory has a higher mean wage and by how much?
Question 4
Find the missing piece of data in each of the following if their mean is $10$.
a) $9,\square,11$
b) $6,\square$
c) $\square,16,2$
d) $25,\square,3,8,20,1$
e) $4,5,6,7,8,9,\square,$
Question 5
Find the missing piece of data in each of the following if their mean is $12$.
a) $12,\square,13$
b) $0,\square$
c) $15,16,13,\square,15$
d) $13.5,\square,12.5,18.5,5.5,7.5$
Question 6
Find the missing piece of data in each of the following if their mean is $6.6$.
a) $\square,6.6$
b) $\square,10,3$
c) $0,8.4,\square,4.2,10$
d) $6.75,\square,2.2,8.25,9.8,16,0.5$
Question 7
Find the mean of the following data set:
a)
Result |
Frequency |
9 |
1 |
10 |
3 |
11 |
1 |
12 |
5 |
b)
Result |
Frequency |
25 |
3 |
26 |
4 |
27 |
2 |
28 |
1 |
c)
Result |
Frequency |
4 |
8 |
5 |
4 |
6 |
10 |
7 |
1 |
8 |
2 |
Question 8
Find the mean of the following (involves negative numbers):
a) $-4,-5,-9$
b) $-16,-5,-20,-11$
c) $-2,2$
d) $-4,-2,3,11$
e) $-10,0,15,-4,-6$
f) $7,-7,8,-8,9,-9$
g) $44,-6,8,-20,15,-35$
h) $-72,84,22,-16,0,44,50,-204$
i) $-125,215,-12,61,77,-821,521,22,124,-5,-124,13$
j) $-5.2,7.3,-33,-3.6,-66,-12.7,22,5.94$
Question 9
Find the missing piece of data in each of the following if their mean is $0$.
a) $\square,6$
b) $12,\square,-1$
c) $\square,32,-16,8,-4.4$
d) $-6,20,\square,44,-18,-9,0$
Question 10
Find the missing piece of data in each of the following if their mean is $-5$.
a) $\square,-2$
b) $0,\square$
c) $\square,4,8$
d) $2,-5,\square,8,-10$
e) $0.4,-4.3,\square,-4.5,-6.2,-9$
Question 11
Answer the following worded questions:
a) Trule Inc. records how its profit over $5$ years:
$\$44,000\quad\$50,000\quad\$12,000\quad\$60,000\quad\$15,000$
What was it's mean annual profit?
b) Iota Inc. records how its profits/loss over $4$ years:
$\$10,000\quad-\$16,000\quad\$34,000\quad-\$4,000$
Calculate the mean profit/loss over the $4$ years.
Answers
Question 1
a) $4$
b) $5$
c) $10$
d) $6$
e) $8$
f) $4$
g) $6$
h) $9$
i) $13$
j) $104$
k) $5.5$
l) $7.25$ or $7\frac14$
m) $8.6$
n) $35$
o) $40\frac{4}{5}$ or $40.8$
Question 2
a) $24.25$
b) $22.6$
c) $39$
d) $4$
e) $140.5$
f) $30.275$
g) $129.9$
h) $384.5625$
i) $2943.75$
Question 3
a) Each day I ate a mean of $3$ pieces of fruit. That's not enough!
b) My mean score is $4$
c) The mean price is $\$4$
d) Their mean age is $12$
e) Factorys Arms has a higher mean wage by $70$ pence or £$0.70$
Question 4
a) $10$
b) $14$
c) $12$
d) $3$
e) $21$
Question 5
a) $11$
b) $24$
c) $1$
d) $14.5$
Question 6
a) $6.6$
b) $6.8$
c) $10.4$
d) $2.7$
Question 7
a) $11$
b) $26.1$
c) $5.4$
Question 8
a) $-6$
b) $-13$
c) $0$
d) $2$
e) $-1$
f) $0$
g) $1$
h) $-11.5$
i) $-4.5$
j) $-10.6625$
Question 9
a) $-6$
b) $-11$
c) $-19.6$
d) $-31$
Question 10
a) $-8$
b) $-10$
c) $-27$
d) $-5$
e) $-6.4$
Question 11
a) $\$36,200$
b) $\$6,000$ profit
Solutions
Question 1
a) The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=2+3+7=12$
There are $3$ numbers.
So the mean $={12}\div{3}=4$
b) The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=1+4+7+8=20$
There are $4$ numbers.
So the mean $={20}\div{4}=5$
c) The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=4+8+11+12+15=50$
There are $5$ numbers.
So the mean $={50}\div{5}=10$
d) The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=8+2+6+8=24$
Order does not matter.
There are $4$ numbers.
So the mean $={24}\div{4}=6$
e) The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=11+2+14+5=32$
Order does not matter.
There are $4$ numbers.
So the mean $={32}\div{4}=8$
f) The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=2+3+4+5+6=20$
There are $5$ numbers.
So the mean $={20}\div{5}=4$
You may also see that either side of $4$, $2$ and $6$ are equally far away and $3$ and $5$ are equally far away so they cancel out to make $4$ the mean.
g) The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=9+5+7+3+6+8+4=42$
Order does not matter.
There are $7$ numbers.
So the mean $={42}\div{7}=6$
You may also want to put the numbers in order.
$3,4,5,6,7,8,9$
You may see that either side of $6$, $5$ and $7$ are equally far away, likewise for the others, so they cancel out to make $6$ the mean without further calculation needed.
h) The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=8+12+4+17+4=45$
Order does not matter.
There are $5$ numbers.
So the mean $={45}\div{5}=9$
i) The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $18+1+17+14+6+2=78$,
Order does not matter.
There are $6$ numbers.
So the mean $={78}\div{6}=13$
j) The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=101+102+105+108=416$,
There are $4$ numbers.
So the mean $={416}\div{4}=104$
k) The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=5+6=11$,
There are $2$ numbers.
So the mean $={11}\div{2}=5.5$
The mean can be any number, including a decimal.
l) The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=7+9+9+4=29$,
Order does not matter.
There are $4$ numbers.
So the mean $={29}\div{4}=7r1=7.25$ or $7\frac14$
m) The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $13+2+7+18+3=43$
Order does not matter.
There are $5$ numbers.
So the mean $=\frac{43}{5}=8\frac35$ or $8.6$
n) The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=18+97+14+11=140$
Order does not matter.
There are $4$ numbers.
So the mean $=\frac{140}{4}=\frac{70}{2}=35$
o) The mean is the sum off all the numbers, divided by how many there are.
The sum of the numbers $=64+14+43+11+72=204$
Order does not matter.
There are $5$ numbers.
So the mean $=\frac{204}{5}=40\frac{4}{5}$ or $40.8$
Question 2
a)
b)
c)
d)
e)
f)
g)
h)
i)
Question 3
a)
b)
c)
d)
e)
Question 4
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b)
c)
d)
e)
Question 5
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b)
c)
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Question 6
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d)
Question 7
a)
b)
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Question 8
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Question 9
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d)
Question 10
a)
b)
c)
d)
e)
Question 11
a)
b)