00:01
All right.
00:01
So the question here it says that the quality control department examines all the products returned to a store by customers.
00:08
So an examination of the return products yield the following assessment, right? so here, 5 % the proportion or the probability of defective that are not repairable is 5%.
00:20
The probability of defectives that are repairable is 0 .45 and the proportion of products that have small surface scratches but are.
00:30
Functioning properly, right, with surface scratches.
00:34
This is 0 .35 and the proportion of non -defective products is 0 .15, right? so here we have a random sample of 20 return products.
00:48
And the first part of the question here is to compute that all 20 of the return products have some type of problem, right? so here we'll use the binomial probability distribution.
01:00
So the probability that all the products have some sort of problem.
01:08
This will probability of x is equal to 20.
01:12
This will be equal to 20c20 into 0 .85 to the power 20 multiplied by 0 .15 to the power 20 minus 20...