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Phone calls arrive at the rate of 48 per hour at the desk for regional airways
1) compute t he probability of recieving three calls in a 5 minute interval of time
2) compute the probality of recieving exactly 10 calls in 15 minutes
Statistics and Probability, Statistics
Determine the sample size n needed to construct a 99?% confidence interval to estimate the population mean when σ=24 and the margin of error equals 9.
According to the center for Disease Control, the mean total cholesterol for men between the ages of 20-29 is 180 milligrams per deciliter with a standard deviation of 36.2. A healthy total cholesterol level is less than ...
Borel wants to be a millionaire when he retires in 40 years. How much does he have to save each month if he can earn a 10% annual return? (round off all answers to 2 decimal places)
A laboratory worker finds that the 3% of his blood samples test positive for the HIV virus. In a random sample of 70 blood tests, what is the mean number that test positive for the HIV virus? (Round your answer to 1 deci ...
Monthly water bills for a city have a mean of $108.43 and a standard deviation of $36.98. Find the probability that a randomly selected bill will have an amount greater than $165, which the city believes might indicate t ...
Let Timco use a capital structure that is 35% debt and 65% equity, The firm can borrow at 6%. The tax rate is 40%. Let the firm beta be 1.9, the market return 14%, and the risk free rate 2%. Find the WACC.
Researchers randomly assigned 25 beginning students of Russian to begin speaking practice immediately and another 25 to delay speaking for 4 weeks. At the end of the semester both groups took a standard test of comprehen ...
A logging truck sales representative will phone either one or two potential buyers per day with probabilities of 0.25 and 0.75, respectively. Each contact will result in either no sale or a $75,000 sale with probabilitie ...
Assume that n = 8, and p = 2/9 1) Find the probability of at least 2 successes and at least 2 failures. 1-56*(2/9)^3*(6/9)^5-70*(2/9)^4*(6/9)^4-56*(2/9)^5*(6/9)^3 wasn't the answer.
The recent Poll revealed that 68 out of 98 men and 45 out of 85 women expressed "at least some support" for a new municipal policy. At the 5% significance level, does the proportion of Supporting the policy differ from t ...
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