I need help with my business statistics homework. I cant come up with the answer to the following questions...?

Posted on 2014-04-21 06:38:00 in Statistics by JESSICA

1. It is estimated that .54 percent of the callers to the Customer Service department of Dell Inc. will receive a busy signal. What is the probability that of today's 1,300 callers at least 5 received a busy signal? Use the poisson approximation to the binomial.





2. Suppose the Internal Revenue Service is studying the category of charitable contributions. A sample of 34 returns is selected from young couples between the ages of 20 and 35 who had an adjusted gross income of more than $100,000. Of these 34 returns 8 had charitable contributions of more than $1,000. Suppose 7 of these returns are selected for a comprehensive audit.



(a) You should use the hypergeometric distribution because you are sampling a small population without replacement.you are sampling a large population without replacement. You are sampling a small population with replacement.



(b) What is the probability exactly one of the seven audited had a charitable deduction of more than $1,000? (Round your answer to 4 decimal places.)

(c) What is the probability at least one of the audited returns had a charitable contribution of more than $1,000? (Round your answer to 4 decimal places.)

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