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The life span of a battery is normally distributed, with a mean of 2000 hours and a standard deviation of 50 hours. What percent of batteries have a life span that is more than 2055 hours?"
Would it be unusual for a battery to have a life span of more of 2055?
A bus company claims that the mean waiting time for a bus during rush hour in less than 7 minutes. A random sample of 20 waiting times has a mean of 5.2 minutes with a standard deviation of 2.1 minutes.
Estimate the number of workers in the sample who are union members by giving the mean of the relevant distribution (that is, the expectation of the relevant random variable). Do not round your response.
The number of defective components produced by a certain process in one day has a Poisson distribution with mean 20. Each defective component has probability 0.6 of being repairable.
certain kinds of tumors tend to recur. the following data represent the lengths of time in months for a tumor to recur
An immediate adjustment will be made on any tire that does not last 50,000 miles." You purchased four of these tires. What is the probability that all four tires will last more than 50,000 miles?
The concentration of glucose(mg/dl) for all samples was measured on one run of a spectrophotometer 1. give the statistical model and full explain each component.
the national center for education statistics reported that 47 of college students work to pay for tuition and living
American food will cause an increase in weights. Use the .01 significance level. A random sample of 11 international students is chosen for the study. What is your conclusion?
Mathml equation = $32,000 and mathml equation = $3000. If 100 teachers are randomly selected, find the probability that their mean salary is greater than $32,500.
the following probability model shows the distribution of doctoral degrees from u.s. universities in 2009 by area of
At the 5% significance level, can the station conclude that the mean age of its listeners is not 25 yrs. Formulate and test the appropriate hypotheses. Use the critical value approach.
A soft drink machine outputs a mean of 24 ounces per cup. the machines output is normally distributed with a standard deviation of 2 ounces. what is the probability of filling a cup between 21 and 26 ounces.
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