# Question

A physical-fitness association is including the mile run in its secondary-school fitness test for students. The time for this event is approximately normally distributed with a mean of 450 seconds and a standard deviation of 40 seconds. If the association wants to designate the fastest 10% of secondary-school students as “excellent,” what time should the association set for this criterion?

## Answer to relevant Questions

The physical fitness of a patient is often measured by the patient’s maximum oxygen uptake (recorded in milliliters per kilogram, ml/kg). The mean maximum oxygen uptake for cardiac patients who regularly participate in ...The number of serious accidents in a manufacturing plant has (approximately) a Poisson probability distribution with a mean of two serious accidents per month. It can be shown that if x, the number of events per unit time, ...Refer to Exercise 6.5. a. Show that x is an unbiased estimator of μ. b. Find σ2x-bar. c. Find the probability that x-bar will fall within 2σ x-bar of μ. Refer to The American Statistician (May 2001) study of female students who suffer from bulimia, presented in Exercise. Recall that each student completed a questionnaire from which a “fear of negative evaluation” (FNE) ...Use a statistical software package to generate 100 random samples of size n = 2 from a population characterized by a normal probability distribution with a mean of 100 and a standard deviation of 10. Compute x-bar for each ...Post your question

0