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The current call at a help desk is going to take 4 minutes to complete. There is only this one phone line at the help

The current call at a help desk is going to take 4 minutes to complete. There is only this one phone line at the help desk. Compute the probability the they will be able to complete the call without the next caller having to wait on hold.

Sbuject: Exponential Random Variables. Find the answer using =expondist formula in Excel. Lambda is 0.2

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