Solution of problem N1297 Poisson probability theory

Solution of problem N1297 Poisson probability theory

1297. The probability that any subscriber will call the switch within an hour is 0.01. The telephone exchange serves 800 subscribers. What is the probability of that; that within an hour 5 subscribers will call?

Additional information:

Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)

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