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9, 15, 21, 21, 23, 23, 24, 26, 27, 30, 30, 31, 35, 48, 61, 62, 63, 63, 64, 74 The playback times in hours for a sample of 20 MP3 players what is the 65th percentile?
Statistics and Probability, Statistics
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I. A statistics instructor wants to measure the effectiveness of his teaching skills in a class of 66 students ( N = 66). He selects students by waiting at the door to the classroom prior to his lecture and pulling asid ...
You work for a firm that manufactures DVD players. Your DVD players last an average of 800 days with a standard deviation of 200 days. You want to set the warranty length such that you only have to replace 1.5% of all th ...
Based on the 1990 census, the number of hours per day adults spend watching television is approximately normally distributed with a mean of 5 hours and a standard deviation of 1.3 hours. What proportion of the population ...
Find the probability and explain the results please. The population mean annual salary for environmental compliance specialists is about ?$60,500. A random sample of 33 specialists is drawn from this population. What is ...
1) Investment A will return to you $2011 in one year if you invest $1750 today. Investment B will return to you $3146 in one year. What is the most you will pay for Investment B? Round to the dollar.
The contents of a particular bottle of shampoo marked as 150 ml are found to be 153 ml at an average, with a standard deviation of 2.5 ml. What proportion of shampoo bottles contain less than the marked quantity? Assume ...
Express Courier Service has found that the delivery time for packages is normally distributed with mean 14 hours and standard deviation 2 hours. a. What percent of the packages will be delivered in less than 18 hours? b. ...
From a random sample of 58 businesses, it is found that the mean time the owner spends on administrative issues each week is 20.53 with a standard deviation of 3.23. What is the 95% confidence interval for the amount of ...
The mean time it takes a technician to resolve a software Issue is 18 minutes with a standard deviation or 4.2 minutes. This information was obtained from a random sample of 10 monitored calls. A sample of 15 monitor cal ...
The diameters of tennis balls are distributed normally. The mean is 2.7 inches and the standard deviation is 0.3 inches. Find the probability that the diameter of a selected bearing is greater than 3 inches. (Round your ...
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