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Question: Customers arrive at a shipping office at times of a Poisson process with rate 3 per hour.
(a) The office was supposed to open at 8 a.m. but the clerk Oscar overslept and came in at 10 a.m. What is the probability that no customers came in the two hour period?
(b) What is the distribution of the amount of time Oscar has to wait until his first customer arrives?
The mean and standard deviation of these values are X‾ = 46.4 and s = 11.27. Assuming normality, test the hypothesis that the average percentage is 45 with α = .05.
Cards are drawn at random from an ordinary deck of 52 cards, one- by-one without replacement. What is the probability that no heart is drawn before the ace of spades is drawn?
Three discrete distributions were discussed in this chapter. Each was defined by a random variable that measured the number of successes.
In a sample of 59 business trips taken by employees in the HR department, a company finds that the average amount spent for the trips was $1,495 with a standard deviation of $458.
explain what problems arise in trying to make conclusions based on a survey mailed to the subscribers of a specialty
What is the median lifetime of these phones (in years)? In addition to selecting one of the multiple choice answers, describe what you did step-by-step to arrive at a solution.
Immigration (optional). In the setting of Exercise, what is the probability of getting a sample in which more than 51% of those sampled think that the level.
six people suffering from weight problems are put on a year-long exercise regimen and their weights before and
Test the null hypothesis that the telephone survey technique has a probability of selecting a household with no children that is equal to the value obtained by the census.
Distributed with a mean of 8 minutes. What is the probability that it will take a worker between four and nine minutes to complete the task?
the proportion of credit-card holders who pay their bill in full each month is 20 the other 80 make only a partial or
a young couple eve and steven want to divide their main household chores shopping cooking dishwashing and laundering
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