JEE Main 2024 Mathematics question
The mean and standard deviation of 20 observations are found to be 10 and 2, respectively. On respectively, it was found that an observation by mistake was taken 8 instead of 12. The correct standard deviation is
Answer: (C)
Solution
Σx = 200 → 204 (mean 10.2) and Σx² = 20(4 + 100) = 2080 → 2080 − 64 + 144 =
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