MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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The mean checkout time in the express lane of a large grocery store is 2.7 minutes, and the standard deviation is 0.6 minutes. The distribution of checkout times is non-normal (for one thing, it can be a lot longer than 2.7 minutes, but it can only be so short).
(a) What is the
0.69150.3085 It cannot be determined from the information given.
(b) What is the probability that the average time of two randomly-selected customers will take less than 3 minutes?
It cannot be determined from the information given.0.2389 0.7611
(c) The probability that the average time of 64 randomly-selected customers will take less than 2.8 minutes is
(d) The probability that the average time of 81 randomly-selected customers will take less than 2.8 minutes is
(e) The probability that the average time of 225 randomly-selected customers will take less than 2.8 minutes is
(f) The probability that the average time of 400 randomly-selected customers will take less than 2.8 minutes is
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