Civil Service Numerical Reasoning Test Basic Statistics 4

Question 1

Data set: 4, 8, 15, 16, 23, 42. What is the median?

Accepted Answer

15.5

Answer

With 6 values, median = mean of 3rd and 4th values. (15 + 16) ÷ 2 = 15.5.

Question 2

Monthly temperatures (°C): 8, 10, 14, 18, 22, 25, 26, 24, 19, 13, 9, 7. What is the range?

Accepted Answer

19

Answer

Range = 26 − 7 = 19.

Question 3

Seven values: 12, 15, 11, 18, 12, 20, 14. What is the mode?

Accepted Answer

12

Answer

12 appears twice (more than any other value). The mode is 12.

Question 4

A manager reviews call times (minutes): 3, 5, 8, 4, 6, 5, 7, 5. What is the mean?

Accepted Answer

5.375

Answer

Sum = 3 + 5 + 8 + 4 + 6 + 5 + 7 + 5 = 43. Mean = 43 ÷ 8 = 5.375.

Question 5

Weekly outputs: 120, 135, 110, 145, 130. What is the mean weekly output?

Accepted Answer

128

Answer

Sum = 120 + 135 + 110 + 145 + 130 = 640. Mean = 640 ÷ 5 = 128.

Civil Service Numerical Reasoning Practice Test