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7. For a group of 200 candidates were sc...

7. For a group of 200 candidates were score misread as 21. Calculull of 200 candidates, the mean and standard deviations of scores to be 40 and 15 respectively. Later on it was discovered that the of 43 was misread as 34. Find the correct mean and standard deviation. andard deviations of a group of 100 observations were

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

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