Question
The lengths of lumber a machine cuts are normally distributed with a mean of 94 inches and a standard deviation of 0.5 inch.(a) What is
The lengths of lumber a machine cuts are normally distributed with a mean of
94
inches and a standard deviation of
0.5
inch.(a) What is the probability that a randomly selected board cut by the machine has a length greater than
94.21
inches?(b) A sample of
45
boards is randomly selected. What is the probability that their mean length is greater than
94.21
inches?
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Prealgebra
Authors: Marvin L Bittinger, David J Ellenbogen, Barbara L Johnson
7th Edition
032164008X, 9780134347202
