Questions:1) what is the probability that less than 68 customers are satisfied with the food quality?2) what is the probability that at least 68 customers are satisfied with the food quality?3) What is the probability that the sample proportion of customers who are satisfied with the food quality is between 80% and 88%?

Andy is a restaurant owner. He believes 83% of his customers are satisfied with the food quality of his restaurant. From a random sample of 81 customers, what are the following probabilities? (Round your answers to four decimal places, if needed.)