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Keith's Florists has 18 delivery trucks, used mainly to deliver flowers and flower arrangements in the Greenville, South Carolina, area. Of these 18 trucks, 7 have brake problems. A sample of 4 trucks is randomly selected. What is the probability that 2 of those tested have defective brakes?
The total profit (in dollars) for sales of x rowing machines is given by P(x) = -0.2x^2 + 300x - 200. What is the profit if 500 are sold? For what value of x will the profit be at a maximum?
Do you reject or fail to reject the null hypothesis? What is the effect size? assuming a=0.05, state your hypothesis for a one tailed test, the critical test statistic, your conclusion?
Random sample from population of male runners in town or city. Create and interpret the 95% confidence interval for mean, mean of the population from which sample is drawn.
A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages. On each page, the mean area devoted to display ads was measured
What is the probability that (a) the birthdays of twelve people will fall in twelve di?erent calendar months (assume equal probabilities for the twelve months).
A sample of employees at a large chemical plant was asked to indicate a preference for one of three pension plans. The results are given in the following table.
In a sample of 450 students from different countries, we found that the number of students in private school in that sample was 50 students.
Standard deviation of 0.7 inches. If 21 items is chosen at random, what is the probability that their mean length is less than 10.5 inches.
The manufacturer would like to establish inventory levels such that there is only a 2.5 percent chance of running out of stock. Where should the manufacturer set the inventory levels?
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.
Consider the relationship between yearly wine consumption (litres of alcohol from drinking wine per person) and yearly deaths from heart disease (deaths per 100,000 people) in 19 developed countries.
epa studies of fuel consumption indicate compact car mileage to be normally distributed with a mean of 25.5 miles per
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