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It is known by experience that 50% of all people that receives some kind of catalog by mail will order some product. FInd the probability that only 3 out of 9 people that receive this kind of catalog will order a product.
What is the probability that the police will strike and the firefighters will not? What is the probability that the firefighters will strike and the police will not?
An economist investigated the association between a country's Literacy Rate and Gross Domestic Product (GDP) and used the association to draw the following conclusions. Explain why each statement is incorrect. (Assume that all the calculations wer..
(a) Find the 95% confidence interval for the average monthly comprehensive car insurance premium paid by all owners of medium-sized cars. Interpret the result. (Use the z-table.) (b) Find the 90% confidence interval for the same problem. Interpret ..
Assume a mean wage of $1,000 and standard deviation of $100. What's the probability of finding an employee with a wage of between $790 and $1000?
Assume that each light bulb works independently of other light bulbs. Determine the probability that all 10 of light bulbs work?
Imagine you are the CEO of a local bank whose credit card holders engage in 1 billion credit card transactions per year; that the likelihood of a fraudulent transaction is 2%
a. Will the total revenue on a day be normally distributed? b. What are the mean and standard deviation of the total revenue on a particular day? c. What is the probability that the revenue will exceed $7,000 on a particular day?
A southern state has an unemployment rate of 6%. The state conducts monthly surveys in order to track the unemployment rate. In a recent month, a random sample of 700 people showed that 35 were unemployed.
out of a sample of 94 purchases at the drive-up window of a fast-food establishment 27 were made with a major credit
Mean output of solar cells of three types are measured six times under random light intensity over a period of 5 minutes, yielding the results shown. Research question: Is the mean solar cell output the same for all cell types?
In a certain city, there are 100,000 persons age 18 to 24. A simple random sample of 500 such persons is drawn, of whom 198 turn out to be currently enrolled in college.
If there were 15 calls, (i) what is the probability that the longest time interval between calls is less than 15 minutes? (ii) What is the probability that the shortest time interval between calls is greater than 5 minutes?
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