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For a group of 200 candidates, the mean ...

For a group of 200 candidates, the mean and standard deviation of scores were found to be 40 and 15 respectively. Later on if was discovered that the scores of 43 and 35 were misread as 34 and 53 respectively. Find the correct mean and standard derivation corresponding to the correted figures.

Answer

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For a group of 200 candidates,mean was found to 40 but it was discovered later that the scores of 43 and 35 were misread as 34 and 53 respectively.Then the correct mean is

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.

Knowledge Check

  • The mean and SD of the marks of 200 candidates were found to be 40 and 15, respectively. Later, it was discovered that a score 40 was wrongly read as 50. The correct mean and SD are respectively

    A
    `14.98, 39.95`
    B
    `39.95, 14.98`
    C
    `39.95, 224.5`
    D
    None of these

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