Posted by tim on .
Five percent of all items sold by a mailorder 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

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

statistics Tola 
PsyDAG,
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? 
statistics tim 
PsyDAG,
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.