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statistics

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A sample of 12 measurements has a mean of 34 and a standard deviation of 4.5. Suppose that the sample is enlarged to 14 measurements, by including two additional measurements having a common value of 34 each.

A. Find the mean of the sample of 14 measurements.

Mean =

B. Find the standard deviation of the sample of 14 measurements.

  • statistics -

    Mean will remain unchanged as 34. but if the new values are different new mean will be computed as

    12(34)+2(34)
    -------------
    12+2

    476/14
    =34

    sample standard deviation

    =

  • statistics -

    Part B op

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