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The mean amount of gasoline and services charged by Key Refining Company credit customers is $70 per month. The distribution of amounts spent is approximately normal with a standard deviation of $10.
A) Compute the probability of selecting a credit card customer at random and finding the customer charged between $70 and $83.B) Compute the probability of finding the customer charged between $82 and $92 last month.C) Compute the probability of finding the customer charged between $57 and $83 last month.D) Compute the probability of finding the customer charged less than $54?E) Compute the probability of finding the customer charged more than $54?F) Suppose Key Refining decided to send a special financial plan to charge account customers having the highest 10% of the money charges. What is the dividing point between the customers who receive the special plan and those who do not?
The following table shows the hardness (in Brinell hardness numbers) and the tensile strength (in thousands of pounds per square inch) of ten specimens of a certain alloy.
Compute an exponential smoothing forecast with a =.20, an adjusted exponential smoothing forecast with a = .20 and B =.20 and a linear forecast. Compare the three forecast, using MAD and average error (E) and indicate which seem to be most accurat..
Each undergraduate course taught cost the college an average of $2,500 in faculty wages, and each graduate courses cost $ 3,000. How many undergraduate and graduate courses should be taught in the fall so that the total faculty salaries are kept t..
Determine a 90% confidence interval on difference in mean number of production units for two shifts. Compute 99% confidence interval for part A.
Probability the second truck is available is .50, and the probability that both trucks are available is .30. What is the probability neither truck is available?
A letter is drawn 1,000 times, at random, from the word A R AB I A. There are two offers. (A) You win a dollar if the number of A's among the draws is10 or more above the expected number. (B) You win a dollar if the number of B's among the drawsis 10..
Candies manufactured by Cherrie Chocolate Candies Co, are supposed to weigh at least 2.00 ounces. A sample of 100 candies yields the following results.
The average stock price for companies making up the S&P 500 is $40, and the standard deviation is $10. Assume the stock prices are normally distributed. What is the probability a company will have a stock price less than $33.
A standard die has its faces painted different colors. Faces3,4,6 are red, faces 2 and 5 are black and face 1 is white.
a) What is the purpose of sampling? b) What are some concerns and dangers of sampling?
State along statistical certainty there is a difference among the population proportions of those favoring Statement.
Using a spreadsheet, create a table that shows the relationship among the units of heights of people in centimeters, inches and feet in the range of 150cm to 2m. Use increments of 5cm.
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