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Twenty times they sold 6 cars, they never sold 7 cars, three times they sold 8 cars and one time they sold 9 cars. Find the probability that at most 4 cars were sold in a week.
Even though independent gasoline stations have been having a difficult time, Susan Solomon has been thinking about starting her own independent gasoline station. What is the minimax regret decision?
One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations of X and Y:
suppose that 20 patients with lung cancer are admitted to the hospital. Calculate the probability that fewer than half of the patients are chain smokers.
If the hotel currently has 84 guests, find the probability that there will not be enough hot water. Does the current system appear to be effective?
n a random sample of 15 Americans 18 years old or older, find the probability that exactly 10 have read at least six books within the past year, Interpret these results.
what percent of players weigh between 175 and 255 pounds? What is the minimum weight for a player above which is considered an outlier?
A researcher at a major hospital wishes to estimate the proportion of the adult population of the United States that has high blood pressure. How large a sample is needed in order to be 98% confiden
Then the percentage of women in the populations is 53% and the percentage of men is 47%. If you were to sample 144 people at random, how many would you expect to be women?
Indicate how many card holders should be sampled to meet the original requirements of the sample. Explain the trade-offs that will occur when you lower the sample to $10,000 to meet the budget.
There is a 60 percent chance that the study will be favorable. Should Mark use the study? Why? What is the maximum amount Mark should be willing to pay for this study? What is the maximum amount he
The mean daily amount of her tips was $84.85. At the .01 significance level, can Ms. Brigden conclude that she is earning an average of more than $80 in tips?
If θ1 and θ2 are unbiased estimators of θ, show that θ3=k1θ1+ k2θ2 is biased estimator of θ. What condition must be imposed on constants k1 and k2, so that
Which is the best measure of central tendency for the scores above? Please explain your answer in your own words to a person who has never had a course in statistics.
What is the average time that catalog customers must wait before their calls are transferred to the order clerk? ( b) What is the average number of callers waiting to place an order?
A local rental car agency has 50 cars. The rental rate for the winter months is 60%. Find the probability that in a given winter month fewer than 35 cars will be rented. (use the normal distribution
Assume the standard deviation of the distribution is 2.5 pounds. find the probability that the mean of a sample of 55 families will be between 17 and 18 pounds.
Find the minimum and maximum prices of the houses that a contractor will build to satisfy the middle 85% of the market. Assume that the variable is approximately normally distributed.
If Accortime does not want to make refunds on more than 3.5% of the watches it makes, how long should the guarantee period be rounded to the nearest month?
Tank has a distribution that is well approximated by a normal curve with a mean of 15.0 gal and standard deviation of 0.1 gal. What is the probability that a randomly selected tank will hold?
If the standard deviation of the diameters of the bearings measured over a long period of time is 0.001 inch, what is the approximate probability that the mean diameter x of the sample of 25 bearing
Construct a 99% confidence interval for the mean time taken by all statistics students to solve the computer assignment. Assume that the time taken to solve this computer assignment by all students
find out how many hamburgers i will need to ensure 96% demand is met, if the mean is 343 and the Standard deviation is 59?
Are the poll results likely to be valid if they are based on only those subjects who agree to respond? What should polling organizations do when they encounter a subject who refuses to respond?
An olympic archer is able to hit the bull's-eye 80% of the time. Assume each shot is independent of the others. If she shoots 6 arrows, what is the probablitly that she never misses?