2023 · Q81
Consider the following distribution for the next two (02) items that follow: Class intervals 0-30, 30-60, 60-90, 90-120 have frequencies 4, 5, 7, 4 respectively. What is the mean of the distribution?
Elementary MathematicsStatistics
- A60
- B72
- C75
- D80
Explanation
Using class midpoints 15, 45, 75, 105 with frequencies 4, 5, 7, 4, the mean is (60 + 225 + 525 + 420)/20 = 61.5. This matches none of the given options (60, 72, 75, 80), so the distribution as transcribed admits no correct answer. Key disputed: verify against the official UPSC key.