Question 1 (10 marks! Interviews will be conducted in a large shopping mall to obtain customers' opinions. Four customers will be randomly selected for this interview. According to the observations, 45% of all customers are male. Use X to denote the number of males in a sample of 4 randomly selected customers, X ~ Bin (n, p). (a) What are the values of n and p? (b) What is the probability that among the 4 selected customers, there is exactly 1 male? (c) What is the probability that among the 4 selected customers, there are more female than male? (d) The interview will be repeated regularly, each time will interview 4 randomly selected customers. What is the average number of male customers in a sample