· A distributor of computer software wants to obtain some customer feedback concerning its newest package. 3000 customer

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A Distributor Of Computer Software Wants To Obtain Some Customer Feedback Concerning Its Newest Package 3000 Customer 1 (40.24 KiB) Viewed 86 times

· A distributor of computer software wants to obtain some customer feedback concerning its newest package. 3000 customers have purchased the package. Assume that 600 of these customers are dissatisfied with the product. Twenty customers are randomly sampled and questioned about the package. Let X denotes the number of dissatisfied customers sampled. a) Find E(x) and Var(X) b) Find the P(X = 3) The number of emergency calls arrive at emergency calling center is often modeled as a Poisson random variable. Assume that on average there are 12 calls per hour. a) What is the probability that there are exactly five calls in one hour? b) What is the probability that there are 3 or fewer calls in one hour?