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The mean of 50 observation is 15 and the...

The mean of 50 observation is 15 and the standard deviation is 2.However one observation was wrongly recorded. The sum of the correct and incorrect observation is 70 . If the mean of the correct set of observation is 16, then the correct variance is

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JEE MAINS PREVIOUS YEAR-JEE MAIN 2022-Question
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