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You need to estimate the mean number of travel days per year for outside salespeople. The mean of a small pilot study was 150 days, with s standard deviation of 14 days. If you must estimate the population mean within 2 days, how many outside salespeople should you sample? Use the 90 percent confidence level.
Assuming the tires are selected at random from among all tires being produced, how many tires in the shipment of 3000 are expected to have a lifetime that is less than 35,000 miles?
A student scores 91 on the midterm exam for physics. Assume the class scores are normally distributed, with a mean of 65 and standard deviation of 15. Into what percentile does this student fall?
Supposing that both tests measure the same kind of ability, who has the higher score? If grading were done on a curve, what would their respective percentages be?
He estimates that he/she has a 45% chance of success with each customer. What is the probability that he/she will earn his/her bonus today?
Natural Science, 415; Social Science, 511; Business Administration, 619; Philosophy, 196. Create a Pareto chart representing this information.
Motorola takes two weeks to supply an order. if the store manager is targeting a fill rate of 99%, what safety inventory should the store carry? What should its ROP be?
a civil service exam yields scores which are normally distributed with a mean of 81 and a standard deviation of 5.5.
suppose the research team feels that more than 75 of airline customers will choose seat b as the most comfortable.
Calculate the average or the median of the average or medians of the samples and compare it with the average of the population.
Finding Normal probabilities using standard normal table or Excel built in functions
If 2 randomly chosen students are surveyed and both feel optimistic about their employment prospects, what is the probability that both were math students?
Five percent of the respondents gave $25,000 or more to charity over the previous year. Develop a 95% confidence interval for the proportion who gave $25,000 or more to charity.
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