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Math check

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The middle 69% of a normally distributed population lies between what two standard scores? (Give your answers correct to two decimal places.)0.31 and 1.69 was my answers and they are wrong????. .

  • Math check -

    You want the Z values containing 69%. Those are -1 <=Z <= 1
    (well, 1.015, really)

    that is, within 1 std of the mean.

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