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The number of hours per week American adults spend on home computers is normally distributed with a mean of 4 hours and a standard deviation of 1.5 hour. An American adult is randomly selected.
(A) Find the probability that this adult spends less than 2.5 hours per week on the computer.
(B) Find the probability that this adult spends between 2.2 hours and 6.5 hours on their home computer per week.
(C) If 35 American adults are randomly selected, how many will say they spend less than 3 hours per week on their home computer?
(b) Use the simplex method to solve this model. Use the resulting optimal solution to identify an optimal policy.
There is an operator at the center who places 25 outgoing calls in a one-hour period. What is the probability that this operator will get live answers on 7 or more calls?
Assuming that any newspaper left over has no value and that running short has no effect on any customer's tendency to return, determine the losses due to understockting and overstockting.
Much attention has recently focused on the incidence of concussions among athletes. Separate samples of soccer players, non-soccer athletes, and non-athletes were selected.
Also give a credible set of highest posterior probability close to 95% for the parameter in question. Plot both the prior and the posterior distributions of the parameter.
In airport luggage screening it is known that 3% of people screened have questionable objects in their luggage. What is the probability that a string of 15 people pass through successfully before an individual is caught with a questionable object
what is the probability that a rearrangement of the word tennessee starts with all four es as the first four
An article about women in business claims that 28% of all small businesses in the United States are owned by women. Find the critical value (or values), and clearly show the rejection and nonrejection regions. Compute the test statistic. Decide wheth..
Assuming that this value is the mean of a normal distribution, and that the standard deviation of the distribution is 3%, what is the value of private consumption as share of GDP such that you are 90% sure that the actual value falls below it?
We expect the results of samples of size 320 to be more predictable (less variable) than the results of samples of size 20. That is "long-run regularity" showing itself.
According to the historical data, the life expectancy in the United States is equal to the life expectancy in Japan. A new study has been made to see whether this has changed.
a simple random sample of size n is drawn from a population with a population mean of 59.2 and standard deviation of
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