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A physical ?tness test was given to a large number of college freshmen. In part of the test, each student was asked to run as far as he or she could in 10 minutes. The distance each student ran in miles was recorded and can be considered to be a random variable, say X. The data showed that the random variable X followed the log-normal distribution with μy = 0.35 and σy = 0.5, where Y = ln X. A student is considered physically ?t if he or she is able to run 1.5 miles in the time allowed. What percentage of the college freshmen would be considered physically ?t if we consider only this part of the test?
suppose you work for a company that manufactures electronics. the development analysts estimate that 2 of their
a student wants to assess whether her dog muffin tends to chase her blue ball more often than she chases her red ball.
Assume that each light bulb works independently of other light bulbs. Determine the probability that all 10 of light bulbs work?
Last semester a certain professor gave 13 as out of 285 grades. if grades were assigned randomly what is the probability of an A.
Are the data sufficient to conclude that children with a history of childcare show significantly more behavioral problems than the average kindergarten child? Use a one-tailed test with a = .01.
There were 155 golfers participating in the second round that day. Estimate the probability that four golfers would score a hole in one on the sixth hole.
Compute the expected number of cars arriving using the expected value formula. Compare results obtained from the simulation.
If level of significance ( α ) is 0.005 in two-tail test, how large is non rejection region under curve of the t distribution?
Find out the probability that a student from the whole school system, chosen at random, has passed?
From experience he knows that he can go another 15 miles. What is the probability that he will be stranded on the highway without gasoline?
The mean time to complete a construction project is 52 weeks with a standard deviation of 3 weeks. Assuming the probability of completing the project follows a normal distribution, what is the probability of completing the project between 56 week..
When assigning probabilities of two simple events, can we assume that each event is always equally likely to occur and, thus assign .5 to each event?
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