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1. The time, in hours, that a copying machine may work without breaking down is a normally distributed random variable with mean 549 and standard devia- tion 68. Find the probability that the machine will work for at least 500 hours without breaking down.
2. The yield, in tons of ore per day, at a given coal mine is approximately nor- mally distributed with mean 785 tons and standard deviation 60. Find the probability that at least 800 tons of ore will be mined on a given day. Find the proportion of working days in which anywhere from 750 to 850 tons is mined. Find the probability that on a given day, the yield will be below 665 tons.
3. Scores on a management aptitude examination are believed to be normally dis- tributed with mean 650 (out of a total of 800 possible points) and standard deviation 50. What is the probability that a randomly chosen manager will achieve a score above 700? What is the probability that the score will be below 750?
Why do so many of life's events share the same characteristics as the central limit theorem? Why are estimations and confidence intervals important? When might systematic sampling be biased?
The length of a human pregnancy has a mean of 267 days and a standard deviatin of 16 days. Assume a normal distribution. What percent of pregnancies last over 283 days.
question weight watchers take a poll of 250 members and finds that 95 of them include exercise with their diet program
What is The probability that the clinic is idle-no patients waiting or being served and The average number of patients in the system?
Estimate the percent that did not have any dental expense. What was the cost for the 10 percent of employees who incurred the highest dental expense?
For the samples summarized below, test the hypothesis at ∞ =.05 that the two variances are equal. Variance Number of data values Sample 1 19 8 Sample 2 9 18
in a data set with a minimum value of 54.5 and a maximum value of 98.6 with 300 observations there are 186 points less
Create a 99 percent confidence interval for difference in means between Line B and Line C.
A simple random sample of 50 speeds (in mph) is obtained from cars traveling on a section of I-10 through Tallahassee. The sample has a mean of 72.3 mph and a standard deviation of 7.4 mph. Use a 0.05 significance level to test the claim that the ..
What are the 3 measures of dispersion/variation in a dataset? How do you calculate each of these 3 measures?
In how many different ways can 5 songs be arranged if a particular song must be the first on the EP?
barrons conducts an annual review of online brokers including both brokers who can be accessed via a web browser as
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