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For a normal distribution, identify the z-score location that would separate the distribution into sections so that there is:

a)60% in the body on the right-hand side
b)90% in the body on the left-hand side

  • statistics -

    60% is to the right of z = -0.25
    90% is to the left of z = +1.28

    "z" is (x-x(mean))/{standard deviation)

    You need a table of the error function or normal distribution to do this kind of problem.

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