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CRA CDs Inc. wants the mean lengths of the "cuts" on a CD to be 140 seconds (2 minutes and 20 seconds). This will allow the disk jockeys to have plenty of time for commercials within each 10-minute segment. Assume the distribution of the length of the cuts follows the normal distribution with a population standard deviation of 8 seconds. Suppose we select a sample of 23 cuts from various CDs sold by CRA CDs Inc.
(a) What can we say about the shape of the distribution of the sample mean?
(b) What is the standard error of the mean? (Round your answer to 2 decimal places.)
(c) What percent of the sample means will be greater than 145 seconds? (Round your answer to 2 decimal places.)
(e) What percent of the sample means will be greater than 133 but less than 145 seconds? (Round your answer to 2 decimal places.)
The dimensions of a rectangle are such that its length is 5 in more than its width. If the length were doubled and if the width were decreased by 2 in., the area would be increased by 52 in squared. What are the length and width of the rectangle?
It is known that the time (in hours) between consecutive traffic accidents can be described by the exponential r.v. X with parameter (Lambda = 1/60). Find (i) P(X
Consider an experimental procedure to measure the average volume of M&M Peanut candies. One hundred piece of the candy are poured into a graduated cylinder with a 30 diameter.
An ad for a computer printer stated that you could buy the printer for only $280.00, or 80 % of the original price . What was the original price of the printer?
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derive the normal equation for fitting the trigonometric curve, p(x) = ao + a1 cos(x) +b1 sin(x)
A grocery store paid $18.00 for 120 pounds of grapes and it wants a 35% average or effective markup based on cost.It expects to move 5% over to the reduced table and sell them for $0.06 a pound. What amount must they price the remainder?
Which city had the greater absolute growth in population? Which city had the greater percentage growth in population.
The format for the final answer should be similar to this one: if the problem is tan^(-1) * (2i). answer: (n + 1/2)*pi + (i/2) * ln(3) , (n =0, +-1, +-2,...)
suppose a one-tailed test is being applied to find out if the population mean is less than 212. The level of significance is .01 and 26 accounts are sampled. What is the critical value?
the score of students taking the act college enterance examination are normally distributed with mean 20.1 and
What are the Present and Future values?
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