JEE Main 2022 Mathematics question
The mean and standard deviation of 50 observations are 15 and 2 respectively. It was found that one incorrect observation was taken such that the sum of correct and incorrect observations is 70. If the correct mean is 16, then the correct variance is equal to :
Answer: (3)
Solution
and . Let a be the correct and b the incorrect observation: a + b = 70. The correct mean is 16, so (750
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