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04-01-2019
Mathematics

contestada

The number of nails of a given length is norm ally distributed with a mean length of 5.00 in, and a standard deviation of 0.03 in. Find the number of nails in a bag of 120 that are over 5.03 in. long.

A. About 40 nails
B. About 30 nails
C. About 20 nails
D. About 10 nails

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mathecoach mathecoach

04-01-2019

Answer:

120·(1 - Ф((5.03 - 5)/0.03)) ≈ 20 nails

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