SOLUTION: In a two-hour period an average of 2 1/2 telephone calls per minutes arrives at a switchboard. Determine the probability that more than six calls arrive in a particular minute.

SOLUTION: In a two-hour period an average of 2 1/2 telephone calls per minutes arrives at a switchboard. Determine the probability that more than six calls arrive in a particular minute.

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Question 1069974: In a two-hour period an average of 2 1/2 telephone calls per minutes arrives at a switchboard. Determine the probability that more than six calls arrive in a particular minute.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
Poisson with parameter 2.5 looking for >6
look at 7
e^(-2.5)2.5^7/7!=0.0099
and 8
e^(-2.5)*2.5^8/8!=0.0031
for 9, 0.0008, and for 10 0.0002
for 11 is 0.000049
0.0132
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