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A population consists of the following five values: 12, 13, 18, 21, and 25. List all samples of size 3, and compute the mean of each sample. (Round...
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A population consists of the following five values: 12, 13, 18, 21, and 25. a. List all samples of size 3, and compute the mean of each sample. (Round your mean value to 2 decimal places.) Sample Values Sum Mean 1 2 3 4 5 6 7 8 9 10 b. Compute the mean of the distribution of sample means and the population mean. (Round your answers to 2 decimal places.) Sample means Population mean A study of long-distance phone calls made from General Electric Corporate Headquarters in Fairfield, Connecticut, revealed the length of the calls, in minutes, follows the normal probability distribution. The mean length of time per call was 3.60 minutes and the standard deviation was 0.40 minutes. a. What fraction of the calls last between 3.60 and 4.20 minutes? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.) (Click to select) (Click to select) (Click to select) (Click to select) (Click to select) (Click to select) (Click to select) (Click to select) (Click to select) (Click to select)
Fraction of calls b. What fraction of the calls last more than 4.20 minutes? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.) Fraction of calls c. What fraction of the calls last between 4.20 and 5.00 minutes? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.) Fraction of calls d. What fraction of the calls last between 3.00 and 5.00 minutes? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.) Fraction of calls e. As part of her report to the president, the director of communications would like to report the length of the longest (in duration) 4 percent of the calls. What is this time? (Round z-score computation to 2 decimal places and your final answer to 2 decimal places.) Duration 0.6

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