Civil Service Numerical Reasoning Test Basic Statistics 1 — Questions and Answers
Question 1: Find the mean of: 14, 18, 22, 10, 16.
- 16 (Correct answer)
- 15
- 17
- 18
Correct answer: 16
Sum = 14 + 18 + 22 + 10 + 16 = 80. Mean = 80 ÷ 5 = 16.
Question 2: Find the median of: 3, 7, 5, 2, 9, 4, 6.
- 5 (Correct answer)
- 6
- 4
- 7
Correct answer: 5
Arranged in order: 2, 3, 4, 5, 6, 7, 9. The middle value (4th of 7) is 5.
Question 3: Find the mode of: 4, 7, 2, 7, 9, 4, 7, 1.
- 7 (Correct answer)
- 4
- 9
- 2
Correct answer: 7
7 appears three times, which is more than any other value. The mode is 7.
Question 4: Find the range of: 45, 12, 67, 33, 89, 21.
- 77 (Correct answer)
- 56
- 67
- 44
Correct answer: 77
Range = highest − lowest = 89 − 12 = 77.
Question 5: A test was scored out of 50. Five students scored: 35, 42, 28, 47, 38. What is the mean score?
- 38 (Correct answer)
- 37
- 40
- 36
Correct answer: 38
Sum = 35 + 42 + 28 + 47 + 38 = 190. Mean = 190 ÷ 5 = 38.
Question 6: Find the median of: 11, 15, 9, 20, 13, 18.
- 14 (Correct answer)
- 13
- 15
- 16
Correct answer: 14
Ordered: 9, 11, 13, 15, 18, 20. With 6 values, median = mean of 3rd and 4th = (13 + 15) ÷ 2 = 14.
Civil Service Numerical Reasoning Test Basic Statistics 1
Find the mean of: 14, 18, 22, 10, 16.