Question

Arrivals to a bank automated teller machine (ATM) are distributed according to a Poisson distribution with...

Arrivals to a bank automated teller machine (ATM) are distributed according to a Poisson distribution with a mean equal to five per 10 minutes.
Determine the probability that in a given 10-minute segment, two customers will arrive at the ATM.

a. 0.0842

b.0.1247

c.0.0028

d. 0.9942

what is the probability that fewer than two customers will arrive in a 30 minutes segment?

a. 0.0028

b. 0.0000

c. 0.0842

d. 0.9942

0 0
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Answer #1

Formula for poisson distribution is (e^-u * u^x)/x!

Where e = 2.718, u is mean which is 5 and x is 2 as per question.

Substitute the values

e^ -5 = 0.006741

5^2 = 25

Probability= (0.006741*25)/2 = 0.0842

Similarly fewer than 2 means per 30 minutes means (2/3) which is 0 in 10 minutes. Hence value is 0.

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