I'm totally lost on the following two problems, can anyone please help me out? Thank you in advance!

1. Survey conducted showed that the average commuter spends about 26 min on a one-way door-to-door trip. Also 5% of commuters reported a one-way commute of over an hour.

a. If 20 commuters are surveyed, what is the probability that three will report a one-way commute of more than one hour?

b. If a company has 2000 employees, what is the expected number of employees with a commute of more than one hour?

2. XYZ Corp. plans to interview Internet users to learn how its proposed Web site will be received by different age groups. 40% of individuals ages 18-54 and 12% age 55 and over use the Internet.

a. How many people from the 18-54 need to be contacted to find an expected number of 10 Internet users?