PERT Data Interpretation & Statistics 3

Question 1

The mean of 5 numbers is 12. What is their sum?

Accepted Answer

60

Answer

Sum equals mean times count, so 12 × 5 = 60.

Question 2

If a value is added that equals the current mean, the mean will do what?

Accepted Answer

Stay the same

Answer

Adding a value equal to the mean does not change the average.

Question 3

In a frequency table, a class has frequency 8 out of 40 total. What is its relative frequency?

Accepted Answer

0.20

Answer

8 divided by 40 equals 0.20.

Question 4

Which graph type best shows parts of a single whole?

Accepted Answer

Pie chart

Answer

A pie chart divides one whole into proportional slices.

Question 5

The mean of 4, 6, 8, and x is 7. What is x?

Accepted Answer

10

Answer

The four values must sum to 28, so x = 28 − 18 = 10.

PERT Practice Test