Measures of Centre and Spread

Click on the resistant measure of spread below

• Median

• Mean

• IQR

• Standard deviation

The scores awarded to 25 students for an assignment were as follows:
4  7  5  9  8  6  7  7  8  5  6  9  8    5  8  7  4  7  3  6  8  9  7  6  9
What is  the mode?

• 6

• 7

• 8

• 9

At Dominique's Donuts the number of donut holes in a bag can vary. Help Dominique find the mode.
12,10,10,10,13,12,11,13,10

• 13

• 12

• 11

• 10

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

• 193

• 127

• 60

• 66

Find the mean of these numbers:
5,11,2,12,4,2

• 4.1

• 6

• 4.5

• 4

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

• 2

• 5

• 7

• 4

Find the mean of these numbers:
2, 57, 38, 42, 6

• 29

• 38

• 50

• 145

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

• 2

• The minimum

• The maximum

• The number of items

In order to find the median, the data must be sorted from least to greatest first.

• True

• False

Find the range.
7, 1, 1, 7, 1, 4, 1

• 6

• 5

• 7

• 3