Find probability that less than three calls were outgoing

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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 calls 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?

Reference no: EM13142360

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