JEE Main 2022 Mathematics question
The mean and variance of 10 observation were calculated as 15 and 15 respectively by a student who took by mistake 25 instead of 15 for one observation. Then, the correct standard deviation is
Answer: 2
Solution
The wrong sum is , so the correct sum is 150 − 25 + 15 = 140 and the correct mean is 14. From the wrong variance , so the
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