00:01
So we are told that the probability that a page contains at least one typographical error is 0 .005 and each page is independent of the others.
00:11
We're looking at a page, a novel, with 400 pages.
00:16
The probability that any individual page contains some number of errors is 0 .005.
00:24
We want the probability that we will have exactly one page with errors and then at most three.
00:30
So i've written out the parameters here and this follows a binomial distribution.
00:38
We have n independent trials for each page of the book, two outcomes for each page, it will have some number of errors or it will have zero errors, same probability p that each page has errors.
00:50
To solve this you could use the binomial formula or you could use technology like software.
00:55
I'm going to use my, i'm going to use excel with the binom .dist function.
01:04
This function has four inputs x the number of pages with errors out of 400, n p and whether or not i want the cumulative probability...