Suppose 61 newly created pairs of jeans are placed in a bin to be checked for quality. Of these, 5 will not be of high enough quality to sell. What is the chance that two pairs of jeans selected will be substandard?
1 Answer
Apr 20, 2017
Let's take them out one by one.
Explanation:
The chance of the first one to be substandard is
The chance of the second to be also substandard is
So the chance of both of them being substandard is:
(this is an AND situation, so we MULTIPLY):
Extra:
The chance of only one to be found substandard is:
