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1.
The time, in hours, that a copying machine may work without breaking down is the normally distributed random variable with mean 549 and the standard deviation 68. Find the probability that the machine will work for at least 500 hours without breaking down - explain your answer (study guide problem 59).
2.
Total annual textbook sales in a certain discipline are normally distributed. 45% of the time, sales are above 671,000 copies, and 10% of the time the sale are above 712,000 copies. Find the mean and the variance of annual sales - explain your answer (study guide problem 72).
Shows a sample mean of 1,261 with a standard deviation of 59. Should Pennsylvania adopt the new system for all toll roads in the state?
What is the expected number of crimes that will be solved? What is the standard deviation?
Determine probability of waiting less than 12 minutes between successive speeders. By using cumulative distribution function of X.
Steps in hypothesis test procedure - conducting a hypothesis test for some general statistic, ? say.
Computing probability values using normal distribution - Find the proportion of the observations will fall in the interval from 40 to 60?
Compute the value of the test statistic. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
Employ the frequency distribution, which describes the response of a survey of college students when asked, "How often do you wear a seat belt when riding in a car driven by someone else?"
It is very difficult for small businesses to be successful. The Small business administration estimates that 20 percent will dissolve or go bankrupt within two years. A sample of 50 new businesses is selected. (show work) (a) What is the mean and ..
The probability of drawing a 6 (to complete an inside straight) after discarding the ace.
If a six appears for the second time, the process is repeated with the move depending on the number shown and the previous throws. If a six appears for the third time, the turn of the player ends without moving the token.
Make three-month and four-month moving averages for this time series. Does the three-month or four month moving average provide the better forecast? Explain.
Which of these following statements provides the best guidance for the model building?
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