1. There are 50 reports to be read. Ten are to be chosen for today’s work. How many different possibilities are there for choosing the reports? If 5 of the 50 reports are important, what is the probability that at least 1 important report is read?
2. Every page in a certain book has a probability of 1 in 50 of having an error on it. If forty pages are examined, what is the probability of there being exactly two pages with errors on them?
3. A certain population has an income distribution given by a normal random variable whose mean is $35000 and whose standard deviation is $7500. What is the probability that a randomly selected person has an income less than $19000?