Assume that the hourly cost to operate a commercial airplane follows the normal distribution with a mean of $4,256 per hour and a standard deviation of $242.
What is the operating cost for the lowest 4% of the airplanes? (Round z value to 2 decimal places and round final answer to nearest whole dollar.)
7.
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Get Help Now!The manufacturer of a laser printer reports the mean number of pages a cartridge will print before it needs replacing is 12,250. The distribution of pages printed per cartridge closely follows the normal probability distribution and the standard deviation is 770 pages. The manufacturer wants to provide guidelines to potential customers as to how long they can expect a cartridge to last.
How many pages should the manufacturer advertise for each cartridge if it wants to be correct 95 percent of the time? (Round z value to 2 decimal places. Round your answer to the nearest whole number.)
8.
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 4.40 minutes and the standard deviation was 0.50 minutes.
a. What fraction of the calls last between 4.40 and 5.20 minutes? (Round z-score computation to 2 decimal places and your final answer to 4 decimal places.)
Fraction of calls
b. What fraction of the calls last more than 5.20 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 5.20 and 6.00 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 4.00 and 6.00 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
9.
A population consists of the following five values: 10, 12, 15, 17, and 20.
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 (Click to select)10, 12, 1510, 15, 1710, 15, 2010, 17, 20
2 (Click to select)10, 12, 1710, 12, 1510, 12, 2010, 15, 17
3 (Click to select)10, 12, 2010, 12, 1510, 12, 1710, 15, 17
4 (Click to select)10, 15, 1712, 15, 1710, 12, 1712, 17, 20
5 (Click to select)10, 15, 2010, 12, 1510, 12, 1710, 12, 20
6 (Click to select)10, 17, 2010, 12, 1510, 12, 1710, 12, 20
7 (Click to select)12, 15, 1710, 12, 1512, 10, 1710, 12, 20
8 (Click to select)12, 15, 2012, 15, 1712, 15, 1012, 10, 15
9 (Click to select)12, 17, 2012, 17, 1512, 10, 1712, 10, 15
10 (Click to select)15, 17, 2015, 17, 1015, 17, 1215, 10, 17
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