well this is actually for my statistics class...
If you are in a statistics course, and have been for four months thus far, then "probability" and probability notation should have been mentioned. Has it not? If not, then lesson links can be provided.
Also, basic concepts of probability, such as "mutually exclusive", should have been mentioned. Have they not? Then lesson links can be provided.
The intention, I suspect, of the previous response was to find out the precise meaning of your statement, "i dont even understand the question!", since, if accurate, no one forum posting could explain the weeks or months of missing classroom instruction. Your assistance in this process would be appreciated. Thank you.