Averages and Grouped Data

Calculate the mean of the scores of 20 students in a mathematics test35

• 30

• 20

• 35

• 40

Find the mean amount of money. You may need to copy out the table with an extra column.

• £12

• £24

• £30

• £35

Calculate mean from the given frequency table.

• 7

• 8

• 9

• 10

How do you work out the mean?

Find the median of these numbers:
2, 3, 4, 5, 5, 7

• 4

• 5

• 4.5

• 6

To find the average or mean of a set of numbers, add up all the items and divide by...

• 2

• The minimum

• The maximum

• The number of items

What is the mean (average) of this data? Round to the nearest tenth.

• 8.0

• 8.3

• 7.5

• 9.0

What is the median height (in cm) of the following:
140, 148, 150, 152, 155, 157, 159, 160, 161, 164, 165, 166

• 157 cm

• 158 cm

• 159 cm 

• none of these

Ervin bowled 7 games last weekend. His scores are: 155, 165, 138, 172, 127, 193, 142. What is the sample standard deviation of Ervin's scores?

• 511.33

• 22.61

• 438.48

• 20.94

Find the mean.
18, 2, 0, 0, 0

• 4

• 5

• 10

• 20