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Scores for a civil service exam are normally distributed, with a standard deviation of 6.9. To be eligible for civil service employment, you must score in the top 5%. If the lowest score you can earn and still be eligible for employment is an 84, what is the mean score for the exam? Round your answer to the nearest tenth.
The Central Limit Theorem states that the sampling distribution of means is:
According to an IRS study, it takes a mean of 330 minutes for taxpayers to prepare, copy and electronically file a 1040 tax form. This distribution of times follows the normal distribution and the standard deviation is 80 minutes.
Supposing that there is no cost of entering the sweepstakes, find the expected value of the amount won for one entry. Determine the expected value if the cost of entering this sweepstakes is the cost of a postage stamp. Is it worth entering the cont..
What sample size must you take to be 96% confident that the results will be within $.75 of the true mean cost per call?
A random sample of 1440 current job applicants results in 61 failures (based loosely on data from the American Management Association).
The probability of the patient being chosen at random as having meningitis as only site of infection is?
The lifetime of a light bulb is an Exponential RV with a mean of 800 hours. Let L represent the time (in hours) that one randomly selected light bulb will burn. What is the possibility the light bulb burns for more than 1000 hours.
A normal population has a mean of 60 and a standard deviation of 3. You select a sample of 36. Compute the probability the sample mean is (Round z values to 2 decimal places and final answers to 4 decimal places):
For each of the following two scenarios/descriptions (pp.2), please select two responses, one to indicate the most appropriate test of inference
Find out the regression variable that correlates best. Among which regression variable, carbon dioxide or methane correlates best with the earth's surface temperature.
Test the proportions of yellow fire trucks have a significantly lower accident rate.
Compute mean and standard deviation for sample of N = 8 females and sample of N = 8 for males.
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