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JEE Main 2022 Mathematics question

MathematicsStatisticsJEE Main 2022

The mean and standard deviation of 40 observations are 30 and 5 respectively. It was noticed that two of these observations 12 and 10 were wrongly recorded. If is the standard deviation of the data after omitting the two wrong observations from the data, then is equal to .

Answer: 238

Solution

and . After omitting the two observations: and $Σ

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Question ID VK-025099