JEE MATHEMATICS MCQ: STATISTICS

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The mean and the standard deviation (s.d.) of five observations are 9 and 0 , respectively.
If one of the observations is changed such that the mean of the new set of five observations becomes 10 , then their d. is?

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Correct option: C

Option C (2) is correct. Since the initial standard deviation is 0, all observations are equal. After changing one observation, the new standard deviation can be calculated.

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