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19 September, 11:01

The number of nails of a given length is normally distributed with a mean length of 5 in. and a standard deviation of 0.03 in. In a bag containing 120 nails, how many nails are between 4.97 in. long and 5.03 in. long?

about 41 nails

about 82 nails

about 60 nails

about 57 nails

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  1. 19 September, 11:04
    0
    z = (4.97-5) /.03=-1

    z = (5.03-5) /.03=+1

    area under normal curve between - 1 and 1 is. 683

    120*.683=82.0 nails are between 4.97 in. long and 5.03 in. long.

    .
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