2023 · Q82
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 standard deviation of the distribution?
Elementary MathematicsStatistics
- A6
- B5
- C3
- D1
Explanation
For the same distribution, Σfx² = 900 + 10125 + 39375 + 44100 = 94500, giving variance 94500/20 − 61.5² = 942.75 and standard deviation ≈ 30.7. This matches none of the given options (6, 5, 3, 1), so the distribution as transcribed admits no correct answer. Key disputed: verify against the official UPSC key.