The lengths of lumber a machine cuts are normally distributed, with a mean of 96 inches and
Question:
The lengths of lumber a machine cuts are normally distributed, with a mean of 96 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 96.25 inches?
(b) You randomly select 40 boards. What is the probability that their mean length is greater than 96.25 inches?
(c) Compare the probabilities from parts (a) and (b).
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a 96 05 z x 9625 96 05 05 P x 9625 P z 05 1 P z 05 1 06915 ...View the full answer
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Related Book For
Elementary Statistics Picturing The World
ISBN: 9780321911216
6th Edition
Authors: Ron Larson, Betsy Farber
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