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Approximately 14 percent of the population of Arizona is 65 years or older. A random sample of five persons from this population is taken. The probability that less than 2 of the 5 are 65 years or older is:
A bank lobby has four video cameras positioned to view the entire lobby. Any one of the four is sufficient to monitor the lobby. Each camera functions independently and has a reliability of 0.90, that is, the probability of functioning is 0.90. A bank robbery takes place. Let a success (x) be defined as a camera functioning. Find the probability that the robbery was filmed at least by one camera.
The listed occupations of stockholders of a regional electric utility company included 9 percent who were homemakers. If six of these stockholders are randomly selected, what is the probability that:No stockholders are homemakers?
Construct a frequency distribution that has 5 classes, and draw:
A sample of approx 25 students enrolled in the university points out that X (bar) = $315.4 and s = $43.20.
If IQ scores on a Stanford-Binet Test are basically distributed with the mean of 100 and a standard deviation of 15, then about how many people in a randomly chosen million would be expected to score at 160 or above?
Is there evidence that the change was successful in reducing the wait time? (use 0.05 level of significance)
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.
What should the cut-off score be for the interviews? (Round to nearest whole number).
Lauren Moore has sold her business for $500,000 and wants to invest in condominium units ( which she intends to rent) and land ( which she will lease to a farmer).
The critical value of F at 95% confidence when there is a sample size of 21 for the sample with the smaller variance, and there is a sample size of 9 for the sample with the larger sample variance is:
In the accompanying table, the random variable x represents the number of televisions in a household in a certain country. Determine whether or not the table is probability distribution. If it is a probability distribution, find its mean and stand..
The Texas Transportation Institute at Texas A&M University conducted a survey to determine the # of hours per year drivers waste sitting in traffic.
Identify each of the random variables as continuous or discrete.
Find a 95% confidence interval for the population mean selling price of all homes in this neighborhood.
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