i am stuck on these questions and do not know how to do it.

5) The defect rate for USB drives is 2%. Mary bought 20 USB drives for her company. What is the probability of getting at least 3 defective USB drives? Part B: Communication (10 marks) 6) Consider the game of spinning the spinner shown to the right. If you spin Yellow, you win 70 points. If you spin Green, you lose 15 points. If you spin Purple, you lose 5 points. Green Purple a) Develop a probability distribution for the points earned per spin. [2 marks] Yellow Green Green Purple Purple Green b) What is the expected number of points per spin? Is this a fair game (justify your reasoning)? [2 marks]