Statistics

If there are 1000 people in a group, how many would you expect to score above 90?

Mean: 85
SD: 10

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  1. go to
    http://davidmlane.com/hyperstat/z_table.html
    enter 85 for the mean, 10 for the SD
    click on above and enter 90 in that box
    read : 0.308538 in the "shaded" part

    so expected number above 90 from 1000 people is
    .308538(1000) = 308.5 , so appr. 309 people

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