Measures of Centre and Spread

A tangerine weighing 120 g is added to the bag. State whether the mean increases, decreases, or stays the same.

• Increases

• Decreases

• Stays the same

At the end of the year, Yolanda received her exam scores for each of her subjects: 40%, 41%, 43%, 44%, 42%, 95%.

To one decimal place, calculate the mean score Yolanda received.

Mathematical Equivalence

ON

To make herself look better when reporting to her parents, should Yolanda use her mean score or median score. Here's her scores again for your reference: 40%, 41%, 43%, 44%, 42%, 95%.

• Mean

• Median

The number of miles that Jenna cycled each week for a 7-week period is shown: 
36, 42, 28, 52, 48, 36, 31 
What is the median number of miles Jenna cycled?

• 24

• 36

• 39

• 52

The number of pages that Carolyn wrote in her journal each day from Monday to Friday is shown below: 
9, 8, 12, 6, 10
What is the mean number of pages she wrote per day?

• 5

• 6

• 9

• 11

What is the standard deviation for the data given:
5, 10, 7, 12, 0, 20, 15, 22, 8, 2

• 6.89

• 10.1

• 7.26

• 9

Which of the following is a measure of variability?

• mean

• median

• mode

• standard deviation

Calculate the interquartile range of the following data17, 18, 18, 19, 20, 21, 21, 23, 25

• 3

• 4

• 5

• 8

What does this symbol represent?

• Standard Deviation

• Variance

• Mean Absolute Deviation

• Sigma

To find the _________ you add up all the numbers and then divide by how many numbers you have.

• Mean

• Median

• Mode

• Range