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1. A particular production process produces bolts whose diameter is a N ( 3, 16) random variable.
(a) Find the probability that a randomly selected bolt will have a diameter less than 3.2.
(b) Find the probability that the average diameter from a sample of 35 bolts will be less than 3.2.
2. Customers arrive at a counter in accordance with a Poisson process of density three arrivals per minute.
(a) What is the expected number of arrivals per minute?
(b) What is the standard deviation of the number of arrivals per minute?
(c) Use the CLT to approximate the probability that the average number of arrivals in 75 I-minute periods is between 2.6 and 3.4.
a recent study reported that the prevalence of hyperlipidemia defined as total cholesterol over 200 is 30 in children
the machining center at a production facility has three lathes of differing ages and thus precision. the oldest machine
in order to accumulate enough money for a down payment on a house a couple deposits 415 per month into an account
What is the probability she received 5 or more email during the same period?
A two-way ANOVA model was used to analyze an experiment with two levels of one factor, three levels of a second factor, and 6 observations per treatment combination.
The time needed to complete a final examination in a particular college course is normally distributed with a mean of 80 minutes and a standard deviation of 10 minutes.
Consider the following quarterly demand levels for electricity (in 1 000 megawatts) in Cape Town from 2008 to 2011.
Standard deviation of 0.7 inches. If 21 items is chosen at random, what is the probability that their mean length is less than 10.5 inches.
james w. has a portfolio that includes 20 shares of disney and 30 shares of amazon. the price of disney stock is
Suppose the likelihood that any flight on Northwest Airlines arrives within 15 minutes of scheduled time is .90. We choose four flights from yesterday for study.
Examinethe differences between profit and profitability and how you plan to use your profits to increase your business profitability.
test for single mean.according to one investigators model the data are like 400 draws made at random from a large box.
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