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Bank tellers
I am the only bank teller on duty at my local bank. I need to run out for 10 minutes, but I don t want to miss any customers. Suppose the arrival of customers can be modeled by a Poisson distribution with mean 2 customers per hour.
a) What's the probability that no one will arrive in the next 10 minutes?
b) What's the probability that 2 or more people arrive in the next 10 minutes?
c) You've just served 2 customers who came in one after the other. Is this a better time to run out?
Draw a histogram of the sample means. Do you notice a difference in the shape of the distribution of sample means compared to the shape of the population distribution?
At this point, you believe customers are now ready to begin risk analysis and understand the risk differences among various investments.
"God exists if and only if either life is meaningful or the soul is not immortal. God exists and the soul is immortal. If God exists, then life is not meaningful." Is it possible that Eric's beliefs make sense?
You calculate that their mean monthly rent is $613 and their standard deviation is $96. What are the degrees of freedom for a one-sample -statistic?
computing the mean and standard errors of sampling distribution.using the central limit theorem find the means and
The chart at the right. Does this sample indicate that songs classified as dance music have lower beats per minute than the songs ranked on a Top 200 list?
12.4 of burglaries are cleared with arrests. a new policeman is assigned to five different burglaries.a. what is the
If the agent has enough time to contact only 15 customers, how confident can she be of selling all four houses within the available time?
An aptitude test has a mean of 220 and standard deviation of 10. find the corresponding z score for:
A humane society reports that 19% of all pet dogs were adopted from an animal shelter. Assuming the truth of this assertion, find the probability that in a random sample of 80 pet dogs, between 15% and 20% were adopted from a shelter
A hypothesis is being conducted. The p-value was found to be 0.0768. For which of the following levels of significance will the null hypothesis be rejected?
Mr. James McWhinney, President of Daniel-James Financial Services, believes there is a relationship between the number of client contacts and the dollar amount of sales.
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