FS Maths Mean and Range

To calculate the mean average of this data set: 

5, 7, 8, 2, 1

We would start by adding up all the pieces of data:

5 + 7 + 8 + 2 + 1 = 23

Then, we divide by how many pieces of data there are.

We have 5 pieces of data.

23 ÷ 5 = 4.6

The mean average is 4.6

Calculate the mean average for this data sets, leaving your answer correct to one decimal place where appropriate

3, 4, 5, 6, 7, 8, 9, 10, 13

3+4+5+6+7+8+9+10+13= 65

65÷9=7.2

Calculate the mean average for this data sets, leaving your answer correct to one decimal place where appropriate

11, 12, 13, 15, 18, 20

11+12+13+15+18+20 = 89

89÷6=14.8

Calculate the mean average for this data sets, leaving your answer correct to one decimal place where appropriate

5, 4, 1, 9, 8

5+4+1+9+8=27

27÷5=5.4

Calculate the mean average for this data sets, leaving your answer correct to one decimal place where appropriate

11, 21, 5, 9

11+21+5+9 = 46

46÷4 = 11.5

Here are some results from a science experiment.

2.5, 3.1, 2.7, 5.0, 3.1, 2.6, 5.8, 3.6

Calculate the mean average result. Give your answer rounded to one decimal place.

Find the range in this set of data:

3, 5, 7, 9, 2, 6

It helps to put the numbers in order of size first, starting with the smallest:

2, 3, 5, 6, 7, 9

Now, select the highest and lowest numbers and find the difference between them. 

9 − 2 = 7

The range is 7

Calculate the range:

5, 7, 2, 5, 4, 9, 3

Order from the smallest:

2, 3, 4, 5, 5, 7, 9

Calculation:

9 - 2 = 7

Calculate the range:

12, 4, 5, 0, 1, 6, 2

Order from the smallest:

0, 1, 2, 4, 5, 6, 12

Calculation:

12 - 0 = 12

Calculate the range:

5, −2, 7, 4, −6

Order from the smallest:

−6, −2, 4, 5, 7

Calculation:

7 - - 6 = 7 + 6 = 13

Calculate the range:

−3, −1, −5, −2, −8

Order from the smallest:

−8, −5, −3, −2, −1

Calculation:

-1 - -8 = - 1 +8 = 7