PERT Data Interpretation & Statistics 2

Question 1

A data set has values 4, 8, 8, 10, 20. What is the median?

Accepted Answer

8

Answer

The median is the middle value of the ordered set, which is 8.

Question 2

Which measure of center is most affected by an extreme outlier?

Accepted Answer

Mean

Answer

The mean uses every value, so a single extreme outlier shifts it strongly.

Question 3

A bar graph shows sales of 30, 45, 25, and 50. What is the total?

Accepted Answer

150

Answer

Adding 30 + 45 + 25 + 50 gives 150.

Question 4

What is the mode of the data set 2, 3, 3, 5, 7, 7, 7, 9?

Accepted Answer

7

Answer

The value 7 appears most frequently (three times), so it is the mode.

Question 5

On a pie chart, a category occupies a 90° slice. What percent of the whole is it?

Accepted Answer

25%

Answer

90° out of 360° equals one quarter, or 25%.

PERT Practice Test