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using a mean of 80 and a standard deviation of 12. a) what is the score that divides the distribution such that 99% of the area is below it. b) what are the scores that bound the middle 95% of the distribution

  • statistics -

    I find this webtool perfect for your kind of question

    use the 2nd applet,
    enter 80 in the mean
    enter 12 in the sd
    and .99 in the "shaded area" box

    click on "below"

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