Question 10
Measures of Central TendencyThe mean of 12 observations is 18. When one observation is recorded as 11 instead of 23, what will the mean be?
- A.17
- B.19
- C.21
- D.25
Show the answer and explanation
Answer: A (17)
Explanation
The correct total is 12 × 18 = 216. Recording 23 as 11 makes the total 12 less, 204, so the mean becomes 204 ÷ 12 = 17.