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CRA, CD's, Inc wants the mean lengths of the "cuts" on a CD be 135 seconds. This will allow the disk jockeys to have plenty of time for commercials within each 10 minite segment. Assume the distribution of the length of the cuts follows a normal distribution with a standard deviation of 8 seconds. Suppose we select a sample of 16 cuts from various CDs sold by CRA CD's Inc. What can we say about the shape of the distribution of the sample mean?
1- 67% of the sample means will be b/w 127 seconds and 143 seconds
2- 95% of the sample means will be b/w 127 seconds and 143 seconds
3- 99% of the sample means will be b/w 127 seconds and 143 seconds
4- 100% of the sample means will be b/w 127 seconds and 143 seconds
Here are fifty observations on the weight of tea bags. Create mean, mode and median.
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Is there a difference in the mean allowances nationally and the mean allowances in northwestern Ohio for nine-year-olds?
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In a normal frequency distribution, 32% of the cases:
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A drug company is considering marketing a new local anesthetic. The effective time of the anesthetic the company is currently producing has a normal distribution with an average of 7.5 minutes and a standard deviation of 1.2 minutes.
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Internal study by Technology Services department at Lahey Electronics disclosed company employees get the average of 2 emails per hour. Suppose arrival of these emails is approximated by Poisson distribution.
A processor of carrots cuts the green top off each carrot, washes the carrots, and inserts six to a package. Twenty packages are inserted in a box for shipment. To test the weight ofthe boxes, a few were checked.
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