Nichelle P. answered • 11/02/15

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Formula: p(x) = (λ

^{x}e^{-λ})/x!λ is your long-run average. You need your units to match and cannot change x, so 6 customers/ 5 minutes = 12 customers/ 10 minutes. 12/10 = 1.2

x = the number you are trying to find the probability of, in this case 8.

e = 2.71828... (it's an irrational number, just like Pi).

p(8) = (1.2

^{8}×e^{-1.2})/8!I will leave the calculation to you. If you would like more Stat help via online tutoring, let me know.