please help this probability and statistics questions with steps, thanksss

. (10 marks) Suppose a sample of 20 citizens in Shakerland is selected as a part of a study of people's opinion about the new product introduced last year. Based on the sales of the product last year, it is believed that around 375% of Shakerland citizens are satised with the product and the rest are not satisfied. What is the probability that exactly 4 of the people surveyed are not satised with the new product? Explain