Question

Five percent of all items sold by a mail-order company are returned by customers for a refund. Find the probability that of two items sold during a given hour by this company both will be returned for a refund

Answer 1

experiment for n=400, p=0.06, where p is the probability of a success

Answer 2

First, if you have a question, it is much better to put it in as a separate post in <Post a New Question> rather than attaching it to a previous question, where it is more likely to be overlooked.

Second, what is your question?

Answer 3

Assuming that the percentage applies to an hour,

First item p=.05
Second item p = .05

The probability of all/both probabilities occurring is found by multiplying the individual probabilities.