MAT 1272 Statistics, SP2014

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  • #13786

    Ezra Halleck
    Participant

    3) In a recent contest w/ normally distributed scores, mean score was 210 and standard deviation was 25.
    a) Find the z score of John who scored 190.
    b) Find the z-score of Bill who scored 270.
    c) If Mary had a z-score of 1.25, what was Mary’s score?
    d) Find each of their percentiles.

    #17985

    Francelia
    Member

    Here’s my answer , click attachment !
    Anybody knows how to do letter (d)

    #17993

    Leonardo Calegare
    Participant

    I do, just use your chart ” Table 4 – Standard Normal Distribution ” and look at the numbers for the z.
    z = -0.8, 0.2119 or 21.19%
    z= 2.4, 0.9918 or 99.18%
    z= 1.25, 0.8944 or 89.44%

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