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A train is made up of 50 railroad cars. Each car made need service with probability 0.05. Let X be the total number of cars in the train that need service.
a) Find the mean and standard deviation of X
b) Find the probability that no cars need service
c) Find the probability that at least two cars need service.
A rental agent claims that the mean monthly rent, mu, for apartments on the east side of town is less than $725. A random sample of 13 monthly rents for apartments on the east side has a mean of $724, with a standard deviation of $15.
a sample of nine public universities and nine private universities was taken. the total cost for the year including
A Patent Medicine Company supervisor assumes that the bottling machine is operating properly if only 5 percent of the processed bottles are not full. A random sample of 100 bottles had 7 bottles that weren't full. Using a significance level of .01..
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02.
As the Marketing Director of Harley-Davidson, you need to determine what your customers would like in the next model. You put a survey on the Harley Web site. Is this a good frame from which to select your sample? Explain.
A sports researcher gave a standard written test of eating habits to 12 randomly selected professionals, four each from baseball, football, and basketball. The results were as follows:
it is decided to measure the resistance of sheets of a certain metal at temperatures x of 100k 200k 300k 400k and 500k.
Use a Normal approximation to find the probability that 75% or more of the women in the sample have been on a diet.
The diameter of stabilizing O-Rings washers manaufactured at a large factory is expected to be normally distributed with a mean of 1.30 inches and a standard deviation of 0.04 inches.
as we have noted in previous chapters even a very small effect can be significant if the if the sample is large enough.
support requests arrive at a software company at the rate of 1 every 20 minutes. assume that the requests arrive as
The weight for a group of 18 month-0ld girls are normally distributed with a mean of 24.4 pounds and a standard deviation of 2.6 pounds. Use the table to find the percentage of 18 month-old girls who weigh more than 27.8 pounds.
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