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    dvitalo's Avatar
    dvitalo Posts: 1, Reputation: 1
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    #1

    Sep 24, 2009, 05:34 PM
    Z score calculation
    With a mean of 69 mph and a SD of 12.6 mph, what percentage of cars were travelling at 60 mph or slower?
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Sep 26, 2009, 11:22 AM
    Just use the formula



    Look up the corresponding value in a z table.
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