Question

Hi. How do you calculate this Poisson Distribution in the TI-83? Thanks.

Step 1

Let ‘*Y*’ be the waiting time between two busses which follows exponential distribution with mean waiting time 30 minutes and arrival rate 1/30. That is, 1 bus in 30 minutes.

The probability that a bus arrives in the next 20 minutes is equal to waiting time less than or equal to 20 minutes. It can be written as,

Step 2

Let *X* be the number of busses arriving in 20 minutes.

So, the avera...

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