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The average number of customers arriving at a drive-through window of a bank branch is 39...

The average number of customers arriving at a drive-through window of a bank branch is 39 per hour during lunch hours. Use X to denote the number of arrivals in a 5 minute time interval. Assume the customers arrive independently and the number of arrivals within each 5 minutes follows a Poisson distribution. Keep at least 4 decimal digits if the result has more decimal digits.

I AM JUST LOOKING FOR WHAT FUNCTION/EQUATION TO PUT INTO MY CALCULATOR TO GET THE ANSWER BELOW... THANK YOU :)

12. The probability that exactly 1 customer arrives in a given 5 minute interval is closest to?

(B) 0.1260

13. The probability that exactly 2 customers arrive in a given 5 minute interval is closest to?

(C) 0.2048

14. The probability that no customers arrive in a given 5 minute interval is closest to?

(A) 0.0388

15. The probability that 2 or fewer customers arrive in a given 5 minute interval is closest to?

(D) 0.3696

16. The probability that 3 or more customers arrive in a given 5 minute interval is closest to?

(E) 0.6304

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