1) A couple is at risk of having children with a recessive disease, having a probability of 0.25 that each child will be affected. What is the probability that if they have three children at least one will be affected?

2)A standard die is rolled. What is the probability of rolling an even number or greater than two?

3) Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn has a number less than 10?

4) A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random without replacement. What is the probability that both balls drawn are red?

5) A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random without replacement. What is the probability that the first ball drawn is green and the second one is blue?

6) A drawer contains an unorganized collection of 14 socks - five pairs are black and two pairs are white. If two socks are drawn at random from the drawer, What is the probability that you will take 2 socks of the same color?

7) A standard die is rolled. What is the probability of rolling an even number or less than 5?

8) A random sample of 15 people is taken from a population in which 40% favor president candidate

What is the probability that exactly 6 individuals in the sample favor this president candidate?

9) Police estimate that 20% of the drivers do not wear their seatbelts. The police set up a safety roadblock and stopping cars to check for seatbelt use.

If the police team stops 30 cars during the first hour, find the mean number of drivers expected to wear seatbelts.

10) Police estimate that 20% of the drivers do not wear their seatbelts. The police set up a safety roadblock and stopping cars to check for seatbelt use.If the police team stops 30 cars during the first hour, what is the standard deviation?

11) If you are rolling a die, what is the probability that you will get your first "2" on the 4th roll?

12) In is estimated that 45% of the people in Fast food restaurants order chicken for lunch. What is the probability that the first person will order chicken is the 4th customer in line?

13) Suppose that 80% of adults with allergies report symptomatic relief with a specific medication. If the medication is given to 10 new patients with allergies, what is the probability that it is effective in exactly 7 patients?