For a group of 200 candidates the mean and S.D. were found to be 40 and 15 respectively. Later on it was found that the score 43 was misread as 34. Find the correct mean and correct S.D.

Explanation

We have


`{n}=200 cdot overline{{x}} 40, sigma=15`


Now,


`overline{{x}}=frac{1}{{n}} sum `{xi}


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