# The answer to Probability problems

1. (TCO 4) What is the probability that the student is a sophomore given he doesn't carry a credit card?

Credit card carrier Not a credit card carrier total

freshman 33 27 60

sophomore 6 34 40

Total 39 61 100

2. (TCO 4) Some students were asked if they carry a credit card. Here are the responses.

What is the probability that the student was a freshman? Please use chart above

3. (TCO 4) What is the probability that the student is a freshman and doesn't carry a credit card?

(Please use chart above).

#### Solution Summary

The solution provides step by step method for the calculation of probability. Formula for the calculation and Interpretations of the results are also included.