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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

It is estimated that .44 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

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