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The diameter of an electric cable is normally distributed, with a mean of 0.8 inch and a standard deviation of 0.01 inch. What is the probability that the diameter will exceed 0.81 inch? (You may need to use the standard normal distribution table. Round your answer to three decimal places.)
Find a 95% confidence interval for the mean amount of money µ spent at the waiter's tables.
the lifetime of zzz batteries is normally distributed with a mean of 270 hours and a standard deviation of 10 hours.
A corporate executive officer is attempting to arrange a meeting of his three vice presidents for tomorrow morning. He believes that each of these three busy persons, independently of the others
a. How many different 3-course meals can be ordered from this menu? (Draw a tree diagram to help visualize this sample space; or use the counting rule to find the total number of meals.)
question jenson solberg and zorn investigated the relationship of insider ownership debt and dividend policies in
given two samples a and b with population size of a 30 sample variance of a 45.3 and a population size of b 25 sample
in a business class 30 of the students have never taken a statistics class 60 have taken only one semester of
No estimate of the population proportion is available. How large a sample is required?
If member of sales force submits the entertainment expense (dinner cost for four) of $190, must this expense be considered unusually high. Calculate and interpret z- score for each of six entertainment expenses.
If there are 81 fraternity members, how much should they buy so that using the normal approximation they are 93.32% sure they will not run out?
Would it be unusual for a return with income of $100,000 or more to be audited? What is the probability that two randomly selected returns with income of $100,000 or more will not be audited?
question a professor used data from last semesters statistics class to create a regression that predicts how students
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