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Suppose X has density function 3x^-4 for x is greater than or equal to 1.
Suppose X has a geometric distribution with success probability 1/4; that is, P(X=k) = (3/4)^k-1(1/4). Find all the medians of X.
ate Management Admissions Test) scores are normally distributed with a mean of 500 and a standard deviation of 100. What proportion of scores fall in the interval from 350 to 450?
The owner of a fast-food restaurant has found the daily demand for ground beef at her restaurant to be normally distributed, with a mean of 680 lb and a standard deviation of 80 lb. Since the fast-f
With .10 significance test the claim that the standard deviation in the number of miles that the brake pads last is less than 10 thousand. Use the critical value method and chart.
The Cooper Auto Repair Center has just received a shipment of 1,000 spark plugs from a supplier. In past shipments, the gap in 6% of the spark plugs obtained from the supplier has been set incorrect
the weight of a randomly selected piece of luggage on international flights has an average of 22.6 pounds and a standard deviation of 5.4 pounds.
A computer repair shop gets computers on regular basis for repairs. The repair time between two computers is exponentially distributed with mean time between repairs of two computers being 2 hours.
The strength of one's immune system can be evaluated in several ways. One of the most popular methods involves measuring the concentration of adenosine triphosphate (ATP) in the blood.
The mean of sample A is significantly different than the mean of sample B. Sample A: 59 48 74 62 87 73 Sample B: 53 67 78 57 93 79 Use a two-tailed t-test of independent samples for the above hypoth
At Mike's Auto Service, the mean time to diagnose a problem is 30 minutes with a standard deviation of 8 minutes. The mean time to perform the repairs once the diagnosis is complete is 180 minutes
We know many types of data fall into a normal distribution with most of the observations falling towards the middle. However sometimes data ar eoutliers or data that are very differnet from the rest
A new integrated computer system is to be installed worldwide for a major corporation. Bids on this project are being solictied, and the contract will be awarded to one of the bidders. As a part of
A random sample of 175 students from a large suburban high school showed that 80 of them participate in team sports run by such organizations. Use a .05 significance level to test a claim that more
A recent political poll for a local election indicated that 70% of the 250 voters sampled preferred Candidate A. Candidate B is surprised by this survey because he thought that the race was a dead h
What pattern would appear in a graph of a Pearson correlation of r = -0.80?
Consider taking samples of size 25 from a population with proportion 0.65. Find the mean of the distribution of sample proportions
Make a control chart to determine what signals, if any, indicate that the process is out of control. Then list the days the signal occurredand the type of signal (I,II,III)
The hard drive reader head is the only likely component to fail, and all that fail are replaced. These have a life expectancy that follows the normal distribution with mean 60 months and standard de
The department of natural resources reports that a fish is unsafe to eat if the polychlorinated biphenol (PCB) concentratio exceeds 5 parts per billion (ppb). A sample of 10 fish taken from a local
It is thought that prehistoric Indians did not take their best tools, pottery, and household items when they visited higher elevations for their summer camps.
From experience a high-jumper knows that he can clear a height of at least 1.78 meters once in 5 attempts. He also knows that he can clear a height of at least 1.65 meters on 7 out of 10 attempts.
A car manufacturer claims that the miles per gallon for a certain model has a mean equal to 40.5 miles with a standard deviation equal to 3.5 miles. Use the following data, obtained from a random sa