can you provide step by step for the three questions

D Question 1 Compute the sampling distribution for two tosses of a fair coin. Assume s=1 for heads and s-0 for win. D Question ? According to a 1995 study. the mean family income in the US was $38,000 with a standard deviation of 21,000. W a consulting agency surveys 47 families at random, what is the probability that it finds a mean family Income of more than $41,500? D Question 3 One year, the distribution of salaries for professional sports players had mean $1.5 million and standard deviation $0.9 million. Suppose a sample of 400 major league players was taken. Find the approximate probability that the average salary of the 400 players that year exceeded $1.1 million