At a carnival, a game is played where you have the chance to win money drawing a ball from a bag. In the bag. there is 14 red balls, 9 green balls, and 2 blue balls. You pay $8 to select a ball from the bag. If you draw a red ball you win nothing. If you select the green ball you win $8. If you select a blue ball, you win $50. What is the mathematical expectation for selecting one ball from the bag? A San Diego interviewer has found that one in five people approached will agree to take part in her survey on drug abuse. An interviewer approaches 7 people at random. Find the probability that at most 2 will agree to an interview. (Binomial Distribution)