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Posted by on Saturday, February 19, 2011 at 7:47am.

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 - , Saturday, February 19, 2011 at 10:37am

    I find this webtool perfect for your kind of question

    http://davidmlane.com/hyperstat/z_table.html

    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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