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The thickness of a laminated covering for a wood surface is normally distributed with a mean of 5 millimeters and a standard deviation of 0.2 millimeter.
a) What is the probability that a covering thickness is greater than 5.5 millimeters?
b) If the specifications require the thickness to be between 4.5 and 5.5 millimeters, what proportion of coverings does not meet specifications?
c) The covering thickness of 95% of samples is below what value?
On a test with a population mean of 75 and standard deviation equal to 16, if the scores are normally distributed, what percentage of scores fall below a score of 83.8?
Suppose that your company manufactures computer equipment and you must determine if a supplier of your company meets the required product specifications.
an airline claims that 65 of its flights depart on time. a sample of 100 flights was examined and it was determined
How many city residents must be surveyed in order to have a 95 percent with a precision of plus/minus 3 trips per month.
The owner of a mail-order catalog would like to compare her sales with the geographic distribution of the population. According to the United States Bureau of the Census
Prepare a frequency distribution from data given below that describes how long it took a person to drive to work in work week.
A coin is tossed 100 times. The difference "number of heads - number of tails" is like the sum of 100 draws from one of the following boxes. which one, and why?
A sample of 10 persons is used to measure the effectiveness of two massage techniques. The effectiveness of the techniques is measured by the number of days that pass by before the subjects feel the need for another massage session.
Distribution and the method of moments estimators of the parameters are alpha(hat)= 5.23 and lambda(hat) = 21.3. Find an asymptotic 95% confidence interval for alpha.
What are the optimal values of A and B? What is the minimum cost and if the cost of B could be reduced to $42 per unit, how many units of B would be optimal? What would the minimum cost be?
A random sample of 12 batteries yields X-bar = 34.2 hours and s = 5.9 hours. Give a 95% confidence interval for the average life of a battery.
The weights (in grams) of four different colors of M&M candies are given below, along with the mean weight and variance of each color, and the variance of the sample means.
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