SOLUTION: 9. Customers arrive at a particular ATM at the rate of 30 customers per hour. a. What is the probability of three customers arriving in a five minute-time interval?

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Question 772204: 9. Customers arrive at a particular ATM at the rate of 30 customers per hour.

a. What is the probability of three customers arriving in a five minute-time interval?
Since it’s for a 5 minute interval: 30/60=0.5/min
0.5*5 mins=2.5 customers for 5 mins
f(3)=2.53e-2.5/3!
=0.21376
b. What is the probability of at least three customers arriving in a five-minute interval? NEED HELP WITH THIS PART
F(≥3)= 1-F(≤2)
=1-2.52e-2.5/2!
c. What is the probability of no customers arriving in a five-minute interval?
F(0)= 2.50e-2.5/0!
=0.08208
Answer by solver91311(24713) About Me  (Show Source):
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Use parentheses, and THEN do your arithmetic.



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