MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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The lengths of lumber a machine cuts are normally distributed with a mean of 99 inches and a standard deviation of 0.4 inch.
(a) What is the probability that a randomly selected board cut by the machine has a length greater than 99.13 inches?
(b) A sample of 39 boards is randomly selected. What is the probability that their mean length is greater than 99.13 inches?
(a) The probability is nothing.
(Round to four decimal places as needed.)
(b) The probability is nothing.
(Round to four decimal places as needed.)
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