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Heights of men on a baseball team have a bell shaped distribution with a mean of 166cm and a standard deveation of 9 cm. Using the empirical rule whats your approximate percentage of men between the following values
157cm and 175 cm
148 and 184
Estimate with 90% confidence the difference in the level of satisfaction with service between the two branches.
suppose that 80 of the accounts are in error. What is the probability that the auditor will find that the sample proportion (P) of the accounts in error will exceedd 0.10?
Generate a 95% confidence interval for the true mean total cholesterol levels in children.
u.s. bureau of the census data reveal the largest town in the state of oh has a population of one million families. the
The population of lengths of aluminium coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.20 inches. A sample of four metal sheets is randomly selected from a batch. What is the possibility that t..
weinstein mcdermott and roediger report that students who were givne questions to be answered while studying new
according to a website about salaries the national average salary as of october 2003 for a human resources clerk was
Suppose that among all participants, the mean test score is 70.07 and the standard deviation is 10.27. Use z-scores to interpret a raw score of 80. What is the corresponding z-score? How would you interpret this result? Show your work.
If the weekly salaries are normally distributed, estimate the fraction of employees that make more than $300 per week.
A 25% loss with probability 0.1 ignoring all other losses what premium should the insurance company charge each season to realize an average profit of $500.
customers arrive at a thrift bank according to a poisson distribution with a mean of 45 customers per hour.
A state transportation official claims that the mean waiting time at exit booths from a toll road near the capitol is no more than .40 minutes. for a sample of 35 motorists exiting the toll road, it was found that the mean waiting time was .46 min..
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