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A number of tubes of toothpaste purchased by a typical family is a random variable having a Poisson distribution with an average of 1,8 tubes per month. What is the probability that a typical family will purchase
1) at least 3 tubes of toothpaste in any given month?
2) less than 2 tubes of toothpaste in any given month?
Ten students in a graduate program were randomly selected. Their grade point averages (GPAs) when they entered the program were between 3.5 and 4.0.
The diameters of oranges in a certain orchard are normally distributed with a mean of 5.26 inches and a standard deviation of 0.500 inches.
in a community with a population of 10000 people the prevalence of a certain disease is 5. a screening test for this
Rulertown wants to minimize the average distance between the fire station and a fire. Where should the fire station be located?
The mean television viewing time for Americans is 15 hours per week (Money, November 2003). Assume a sample of 60 Americans is taken to further investigate viewing habits. Suppose the population standard deviation for weekly viewing time is Q = 4..
Roberta scored in the 85th percentile on a standardized test of reading ability. What is Roberta's associated z score?
Population have at least some college education. choose 10 persons at random. Find the probability that at least 5 do not have any college education.
A ski company in Vail owns two ski shops, one on the east side and one on the west side. Sales data showed that at the eastern location there were 56 pairs of large gloves sold out of 304 total pairs sold.
At the .05 significance level, can we conclude that there is a difference in their mean times?
The analysis needs to be re-run adding the error into the regression sum of squares.
Find that the student from class A is a fair student whereas the student from class B is a poor student, what is the probability that class A is the superior class?
2 laptops are chosen at random without replacement, what is the probability that both are high priced?
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