What is probability that at least two calls the lines

Reference no: EM13555186

The phone lines to an airline reservation system are occupied 40% of the time. assume that the events that the lines are occupied on successive calls are independent. assume that 20 calls are placed to the airline.

a) what is probability that at least two calls the lines are occupied?

b) what is the probability that all twenty calls go through right away

c)what is the expected number of call in which the lines are occupied?

Reference no: EM13555186

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