Basic Statistics Flashcards
6 cards from real Civil Service Numerical Reasoning Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Basic Statistics flashcards as text
Data set: 4, 8, 15, 16, 23, 42. What is the median?
Answer: 15.5
With 6 values, median = mean of 3rd and 4th values. (15 + 16) ÷ 2 = 15.5.
Monthly temperatures (°C): 8, 10, 14, 18, 22, 25, 26, 24, 19, 13, 9, 7. What is the range?
Answer: 19
Range = 26 − 7 = 19.
Seven values: 12, 15, 11, 18, 12, 20, 14. What is the mode?
Answer: 12
12 appears twice (more than any other value). The mode is 12.
A manager reviews call times (minutes): 3, 5, 8, 4, 6, 5, 7, 5. What is the mean?
Answer: 5.375
Sum = 3 + 5 + 8 + 4 + 6 + 5 + 7 + 5 = 43. Mean = 43 ÷ 8 = 5.375.
Weekly outputs: 120, 135, 110, 145, 130. What is the mean weekly output?
Answer: 128
Sum = 120 + 135 + 110 + 145 + 130 = 640. Mean = 640 ÷ 5 = 128.
Data: 9, 12, 15, 12, 18, 9, 12, 21. What is the mode?
Answer: 12
12 appears three times — more than 9 (twice) or any others. The mode is 12.