Using The Most Recent Itemized Phone Bills Assume That Incoming And Out Going Ca

Using the most recent itemized phone bills. Assume that incoming and out going calls are equal in the population. This means assume p=0.5. For the number of calls made last month, what would be the mean number of outgoing calsl in a random selection of calls? Also, compute the standard deviation. In a selection of 12 calls, what is the probability that less than 3 were outgoing?

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