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A sample of 2 different calculators is randomly selected from a group containing 18 that are defective and 37 that have no defects. What is the probability that the 2 calculators chosen have no defe
Let x be a random variable corresponding to the sum of the numbers on two fair dies(Hints, 2,3,4,....,12), Find the probability of P{x<8}.
What is the probability that Lisa smiles at Milhouse on exactly three days in a month? Use a Poisson approximation to calculate the probability that Lisa smiles at Milhouse on exactly three days in
A population has a known standard deviation of 25. A simple random sample of 49 items is taken from the selected population. The sample mean (x-bar) is 300. What is the margin of error at the 95% co
Body mass index for newborns follows a normal distribution with a mean of 14 and standard deviation of .95. A doctor delievers 3 babies a day. What is the probability the average body mass index is
One person has 3 dollars to gamble; each time he uses only one dollar, the probability is 60% to lose and 40% to win. If he accumulates 5 dollars or loses 3 dollars, he will stop the gamble. Using t
An extensive survey of customers of three major cable companies(A,B,and C) found the following: Company A will keep 71% of its customers, 12% will move to B and the rest will move to C
Determine the probability that exactly two of these vehicles require warranty service. Compute the mean and standard deviation of this probability distribution
The Downtown Parking Authority of Tampa, Florida, reported the following information for a sample of 241 customers on the number of hours cars are parked and the amount they are charged.
Find the distribution of the market by finding the steady state vector.
Gymnorhina tibicen, mist netted 25 adults from an isolated rural area and 36 from an urban picnic area. She measured the total body lengths in centimeters and reported the following summary statisti
Historically a bank expects about 5% of its borrowers to default (not repay). The bank currently has 250 loans outstanding. The bank also has enough reserves to cover losses if 25 of these loans wer
However, for her pay, she receives $8 per day from her employer plus $.07 commission on each ice cream sale. Find (a) her expected daily profit, and (b) the standard deviation of her daily profit
Find the probability of (a) at least 2 orders for letterhead arriving tomorrow, (b) no orders in the next 2 days. (c) Find the expected number of orders in the next 30 working days. (d) What is the
A box contains 2 red, and 3 white, and 5 green balls. Two balls are drawn out of the box in succession without replacement.
A wins any particular game is 0.49 ( and so B wins any one game with probability 0.51). What is the expected number of games in the series?
A sample of 400 large companies showed that 120 of them offer free health fitness centers to their employees within the company premises. If one company is selected at random from this sample, what
Discuss reliability and validity in qualitative research.
A box contains 3 red and 9 blue balls. Suppose 5 balls are drawn at random(without replacement) from the box. Let Y be the number of red balls drawn. Determine the probability mass function for Y.
There are two types of machines called type A and type B. Both type A and type B can be used to produce a certain product. The production manager wants to compare efficiency of the two machines. He
When comparing the variances of two normally distributed populations using independent random samples, the correct test statistic to use is __________.
When evaluating a new process, using the square root of the upper end of the confidence interval for ?2 gives an estimate of the smallest that ? for the new process might reasonably be.
Suppose that the probability that a duck hunter will successfully hit a duck is 0.40 on any given shot. Suppose also that the outcome of each shot is independent from the others.
The mode of a discrete random variable X with p.m.f. p(x) is that value x* for which p(x) is largest (the most probable x value). Consider X { # failures before 1st success}, distributed geometric(p
An inspector is looking for nonconforming wells in the gasolinepipeline between Phoenix and Tucson. The probability that oneparticular weld will be defective is 0.01. The inspector isdetermined to k