Measures of Centre and Spread

Find the median.
12, 5, 9, 18, 22, 25, 5

• 9

• 8

• 12

• 18

Find the range.
12, 5, 9, 18, 22, 25, 5

• 20

• 15

• 22

• 18

To find the ________ you put all numbers in order from least to greatest and find the number that is in the middle.

• Mean

• Median

• Mode

• Range

To find the ______ you put all the numbers in order from least to greatest and then see which number you have the most of.

• Mean

• Median

• Mode

• Range

To find the ______ you put all numbers in order from least to greatest and then take the largest number minus the smallest number.

• Mean

• Median

• Mode

• Range

What is the median of this data set?
3 , 17 , 17 , 11 , 8 , 13 , 5 , 18

• 11

• 12

• 13

• 17

The heights (in centimetres) of 3 month old puppies were recorded by a scientist, and are shown in the stem and leaf plot below.

Find the median.

The heights (in centimetres) of 3 month old puppies were recorded by a scientist, and are shown in the stem and leaf plot below.

Find the upper quartile (Q3)

The following data was collected from 10 students about the number of hours they work per week.

18 3 15 19 12 10 0 24

Find the mean

The following data was collected from 10 students about the number of hours they work per week.

18 3 15 19 12 10 0 24

Find the median