Mastering Mean: Finding Averages and Identifying Outliers

A class of 5 students scored the following on a test: 80, 85, 90, 95, and 100. What is the mean score?

• 85

• 95

• 90

• 100

In a basketball game, a player scored 10, 15, 20, 25, and 30 points in five games. What is the mean number of points scored per game?

• 20

• 30

• 25

• 15

Emma has 4 friends. They each have the following number of stickers: 5, 7, 8, and 10. If Emma has 20 stickers, what is the mean number of stickers per person?

• 8

• 12

• 15

• 10

A gardener measured the heights of 5 plants: 12 cm, 15 cm, 14 cm, 13 cm, and 50 cm. What is the mean height of the plants?

• 20.8 cm

• 25 cm

• 22 cm

• 18 cm

During a week, a student read the following number of pages: 30, 25, 40, 35, and 100. What is the mean number of pages read, and how does the outlier affect it?

• The mean number of pages read is 50, and the outlier has no effect.

• The mean number of pages read is 40, and the outlier decreases the mean.

• The mean number of pages read is 46, and the outlier increases the mean.

• The mean number of pages read is 45, and the outlier slightly decreases the mean.

A family spent the following amounts on groceries over 5 weeks: $150, $200, $250, $300, and $1000. What is the mean spending, and what is the outlier?

• Mean spending is 380, and the outlier is 1000.

• Mean spending is 500, and the outlier is 150.

• Mean spending is 250, and the outlier is 200.

• Mean spending is 400, and the outlier is 300.

In a science experiment, the weights of 5 apples were recorded as 150g, 160g, 155g, 165g, and 300g. What is the mean weight of the apples?

• 170g

• 180g

• 186g

• 200g

A teacher recorded the number of books read by her students: 3, 5, 4, 6, and 50. What is the mean number of books read, and how does the outlier affect the mean?

• The mean number of books read is 20, and the outlier decreases the mean.

• The mean number of books read is 13.6, and the outlier increases the mean.

• The mean number of books read is 10, and the outlier has no effect on the mean.

• The mean number of books read is 15, and the outlier is irrelevant to the calculation.

A group of friends went to the movies and spent the following amounts: $10, $15, $20, $25, and $100. What is the mean amount spent, and what is the outlier?

• Mean: 40, Outlier: 20

• Mean: 30, Outlier: 25

• Mean: 35, Outlier: 15

• Mean: 34, Outlier: 100

In a survey, the number of pets owned by 5 families was recorded as 1, 2, 3, 4, and 20. What is the mean number of pets, and how does the outlier affect the mean?

• The mean number of pets is 10, and the outlier (20) has no effect on the mean.

• The mean number of pets is 6, and the outlier (20) raises the mean.

• The mean number of pets is 8, and the outlier (20) slightly raises the mean.

• The mean number of pets is 5, and the outlier (20) lowers the mean.