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According to the U. S. Center for Health Statistics the probability that a randomly selected twenty year old will live to age 65 is 80%. A club has twenty members aged twenty. What are the chances that at least one fourth of them will die before their 65th birthdays?
(a) 59%
(b) 63%
(c) 20%
(d) 80%
(e) 37%
Find the maximum and minimum prices of the houses a contractor will build to include the middle 65% of the market.
What is the likelihood that none of the selected flights arrived within fifteen minutes of scheduled time?
The manager for Select-a-Seat, a company that sells tickets to athletic games, concerts, and other events, has determined that the number of people arriving at the Broadway location on a typical day is Poisson distributed with a mean of 12 per hou..
The amounts of money requested on home loan applications at Down River Federal Savings follow the normal distribution, with a mean of $70,000 and a standard deviation of $20,000.
A sample of 64 observations is selected from a normal population. The sample mean is 215, and the sample standard deviation is 15. Conduct the following test of hypothesis using the .03 significance level.
The diameters of oranges in a certain orchard are normally distributed with a mean of 5.26 inches and a standard deviation of 0.50 inches.
The carpeting department supervisor claims that the average number of days between the receipt of a complaint and its resolution is 20 days or less.
Medical studies have shown that 10 out of 100 adults have heart disease. When a person with heart disease is given an EKG test, a 0.9 probability exists that the test will indicate the presence of heart disease.
For the 20 test scores shown, find the percentile rank for a score of 86.
What is the standard deviation of expected returns for Stock X? For Stock Y?
A statistical study reported that a drug was effective with a p-value of .042. Explain in words what this tells you.
Be sure to include information about how you would use the concept of probabilities to apply to profiles for hiring more satisfied individuals.
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