00:01
For this question, we're asked to use the poisson distribution to find the indicated probability.
00:04
So mount search and rescue team receives an average of 0 .71 calls per day.
00:09
Find the probability that on a randomly selected day, they'll receive fewer than 2 calls.
00:16
So we're looking for the probability that x is less than 2.
00:23
So that means probability of 1 plus the probability of 0.
00:27
So plus on distribution simply says the probability of x.
00:32
Is simply going to be equal to e to the negative lambda times lambda to the x over x factorial.
00:39
In this case, lambda is going to be the average that we have.
00:43
So in our case, the average is 0 .71.
00:46
X is going to be the number of trials.
00:48
So we're going to have 1 and 0...