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statistics

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A population of N=8 scores has a mean of M =20. If one score is changed from X=14to X=30 , what would be the value for the new mean.

  • statistics - ,

    (a + 14)/8 = 20

    (a + 30)/8 = m

    a + 14 = 160
    a + 30 = 8m
    ---------------
    14 - 30 = 160 - 8m

    8 m = 160 + 16 = 176
    m = 176/8 = 22

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