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The distribution of piston diameters is normally distributed. It is known that 10% of all pistons have diameters exceeding 20 inches and 5% have diameters smaller than 10 inches. What are the mean and SD of the distribution?
Suppose the score of architects on a partecular creativity test are normally distributed. What percetage of architects have a Z scores (A) above .10.
The number of hours per week American adults spend on home computers is normally distributed with a mean of 4 hours and a standard deviation of 1.5 hour. An American adult is randomly selected.
In a normal distribution with mean 3 and variance 49, what are the upper and lower limit scores for the middle 50% of the data?
Assume the population standard deviations are not the same. At the .05 significance level, is there a difference in the mean waiting time?
refer to the following frequency distribution for questions 1 2 3 and 4.the frequency distribution below shows the
the average number of mosquitos caught in 81 mosquito traps in a particular environment was 900 per trap. the standard
In an instrumentation system, there is a need to take the difference between two signals, one of v1 = 2sin(2π × 60t) + 0.01 sin(2π × 1000t) volts and another of v2 = 2sin(2π ×60t)-0.01 sin(2π ×1000t) volts.
Consider a sample with data values of 10,20,12,17, and 16.... Compute the mean and median and explain how you get to the answer....
an exam was given to a random sample of 360 new recruits. px is the probabiity of new recruits with a score of x. the
if x is a binomial random variable where n100 and p.1 find the probability that x is less than or equal to 12 using the
A survey of licensed drivers inquired about running red lights. One question asked, "Of every ten motorists who run a red light, about how many do you think will be caught?"
a random sample has been taken from a normal distribution and the following confidence intervals were constructed using
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