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Question: The mean time that a certain model of light bulb will last is 400 hours, with a standard deviation equal to 50 hours.
a. Calculate the standardized value for a light bulb that lasts 500 hours.
b. Assuming that the distribution of hours that light bulbs last is bell-shaped, what percentage of bulbs could be expected to last longer than 500 hours?
Use the given frequency distribution to find the Class width
If 200 workers are randomly chosen, what is the probability that at least 120 of them believe that technology has lengthened their workday.
State the null and alternative hypotheses to be tested. Compute the test statistic. Determine the critical value for this test at the 0.05 level of significance. What do you conclude?
a medical test for malaria is subject to some error. given a person who has malaria the probability that the test will
In any given month, the probability that a manufacturer will have an accident is 35%, What is the probability that in a 6 month period, the manufacturer will have two or fewer accident free months?
the following question was put on a questionnairewhat was your last salary?a 0 -10000b 10001 - 20000c 20001 - 30000d
Find and interpret a 95% confidence interval for the mean amount stolen. Find and interpret a 95% confidence interval for the mean number of bank staff present at the time of robberies.
A company has 10 salespeople. A board member at the company ask for a list of the top 5 salespeople, ranked in order of effectiveness. How many lists are salespeople possible? Assume that the order of the salespeople on the list is relevant.
the owner of brittens egg farm wants to estimate the mean number of eggs laid per chicken. a sample of 20 chickens
question 1using the telephone numbers listed in your local directory as your population randomly obtain 20 samples of
A company's records indicate that on any given day, 1% of their day shift employees and 2% of the night shift employees will miss work. Sixty percent of the employees work the day shift. What percent of employees are absent on any given day?
Solve the problem using the graphical solution procedure. Find out the optimal percentage allocations and the optimal total portfolio return
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