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Consider an elevator in a building with N floors above the ground floor. If the number of people entering an elevator on the ground floor is a Poisson random variable with mean 12, and if each person is equally likely to get off at any floor, independently of the others, compute the expected number of stops that the elevator will make before discharging all of its passengers.
seventy-eight percent of the light aircraft that disappear while in flight in a certain country are subsequently
SAT scores are normally distributed with a mean of 500 and a standard deviation of 100. What percent of test takers score less than 300?
A sample of 23 European countries found that the variance of life expectancy was 7.3 years. What is the 95% confidence interval estimate for the variance of life expectancy in Europe?
The 7th degree polynomial x^7 - 3x^6 - 7x^4 + 21x^3 - 8x + 24 has a factor (x - 3). Divide x^7 - 3x^6 - 7x^4 + 21x^3 - 8x + 24 by x - 3 and thus:
How does the bell-shaped curve for the sampling distribution of sample means for samples of size n = 100 compare to the bell-shaped curve for sampling distribution of sample means for samples of size n = 60.
Of the drivers who stop at a gas station, 92% purchase gasoline, and 6% purchase both gasoline and oil. A total of 7% purchase oil.
a set of final examination grades in a calculus course was found to be normally distributed with a mean of 70 and a
final averages are typically approximately normally distributed with a mean of 71 and a standard deviation of 8. your
In a random sample of 15 Americans 18 years old or older, find the probability that exactly 10 have read at least six books within the past year, Interpret these results.
in a poll of 600 randomly selected subjects 240 answered yes when asked if they planned to vote in a state election.
To test the hypothesis that students who finish an exam first get better grades, Professor Hardtack kept track of the order in which papers were handed in.
Suppose we wish to predict the crawling age of a particular baby when the average outdoor temperature is 25°F six months after birth.
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