A personnel director interviewing 9 senior engineers for four job openings has scheduled seven interviews for the first day and two for the second day of interviewing. Assume that the candidates are interviewed in a random order. (a) What is the probability that x of the top four candidates are interviewed on the first day? h(N; 7, 9, 4)h(x; 2, 9, 4) h(x; 7, 4, 9)h(N; 2, 4, 9) (b) How many of the top four candidates can be expected to be interviewed on the first day? (Round your answer to two decimal places.) candidate