1. (8 points) At the RTA customer happiness centre customers can report their overall satisfaction with the service as "happy", "neutral", or "sad". It is believed that 10% of all RTA customers report their overall satisfaction as "sad". A survey asked 20 RTA customers to report their overall satisfaction as "happy", "neutral" or "sad". a. What is the probability that none of the customers report their overall satisfaction as "sad"? b. What is the probability that more than two people are "sad"