Assume the number of commuters using the QR code payment service at each MTR station follows a Poisson probability distribution. Based on recent statistics, on average, 3 commuters use the QR code payment service in an hour. (i)  What is the probability there are exactly 4 commuters who use the QR code payment service in an hour? (ii)  What is the probability that there are less than 4 commuters who use the QR code payment service in 3 hours? (iii) If five MTR stations are randomly selected, what is the probability that at least two of the five MTR stations will have less than 4 commuters who use the QR code payment service in 3 hours?

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Assume the number of commuters using the QR code payment service at each MTR station follows a Poisson probability distribution. Based on recent statistics, on average, 3 commuters use the QR code payment service in an hour.

(i)  What is the probability there are exactly 4 commuters who use the QR code payment service in an hour?

(ii)  What is the probability that there are less than 4 commuters who use the QR code payment service in 3 hours?

(iii) If five MTR stations are randomly selected, what is the probability that at least two of the five MTR stations will have less than 4 commuters who use the QR code payment service in 3 hours?

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