A survey of 200 college graduates who have been working for at least 3 years found that 90 owned only mutual funds, 20 owned only stocks, and 70 owned both.
a) What is the probability that an individual owns a stock? A mutual fund?
b) What is the proability tha an individual owns neither stocks nor mutual funds?
c) What is the probability that an individual owns either a stock or a mutual fund?