Mean and variance of the number of students
A television station estimates that 60% of college students watch the super bowl. For a sample of 240 students selected at random, what is the mean and variance of the number of students who watch this game?
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A random variable is normally distributed with a mean of 25 and a standard deviation of 5. If an observation is randomly selected from the distribution, determine two values of which the smallest has 25% of the values below it and the largest has
The average hourly wage of workers at a fast food restaurant is $6.50/hr with a standard deviation of $0.45. Assume that the distribution is normally distributed. If a worker at this fast food restaurant is seleceted at random, what is the probab
If 16 doctors are chosen at random for a committee find the probability that the average age of those doctors is less than 45.45 years.
On the average, the annual profits are $8000 for each elementary book, $7000 for each intermediate book, and $1000 for each advanced book. How many new books of each type should be published to maximize the annual profit while conforming to compa
The admissions staff asked graduates outside their immediate area and outside the state to help with recruiting. In addition, some money was spent on media advertising.
Does the difference between the probabilities of parts (a) and (b) explain how insurance companies stay in business? Large auto insurers are certainly profitable. One report, for example, claims that All state pays out less than $0.50 in accident
If Ho: B1 = 0 is not rejected, what is the best estimate for the value of the response variable for any value of the explanatory variable?
Decide whether the normal sampling distribution can be used claim p does not equal .28, a=.01; sample stats 0=.19 n=100
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