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The post office uses a multiple channel queue, where customers wait in a single line for the first available window. If the average service time is 1 minute and the arrival rate is 7 customers every five minutes, find, when two service windows are open, (Use Management Scientist, Make sure that l and m are in the same units).
a. the probability both windows are idle.
b. the probability a customer will have to wait.
c. the average time a customer is in line.
d. the average time a customer is in the post office.
there are 30 tennis balls in a box of which 18 are new and have never been used. three of the 30 balls are selected at
If the store owner's claim is correct, what is the probability that fewer than 24 customers in the sample buy coffee during their visit on that certain day of the week?
let x denote the amount in pounds of polyurethane cushioning found in a car. the density for x is given by fx1in21x
suppose that there are seven prospective jurors four men and three women who might be impaneled tosit on a jury in a
q1. assuming that the data are normally distributed with a mean of 25 and a standard deviation of 1.25 what is the
body mass index for newborns follows a normal distribution with a mean of 14 and standard deviation of .95. a doctor
spiders webs angles to the vertical of the earths surface are recorded. the following questions can be answered using
Calculate a four-quarter weighted moving average for the number of America Online (AOL) subscribers for the nine quarters of data. The data are reported in thousands.
Your current sales revenue in the new year is projected to be $505,000. Find the indifference point (the break even point of sales revenue at which the fixed rent and variable rent for a year are the same). Explain which alternative you would acce..
If we assume that attention spans are normally distributed, find a 95% confidence interval for the mean attention span of children playing with this new toy. What is the lower limit of the confidence interval.
In each of the following cases. find the mean , variance and standard of the sampling distribution of sample proportion p.
A large retail corporation plans to sample sales receipts of its meat department to estimate the average size (in dollars) of a customer purchase. Previous analysis suggest that the standard deviation of the purchase amount is approximately $50.72..
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