The sales records of a real estate agency show the following sales over the past 200 days: Number of Number Houses Sold of Days 0 60 1 80 2 40 3 16 4 4 a. How many sample points are there? b. Assign probabilities to the sample points and show their values. c. What is the probability that the agency will not sell any houses in a given day? d. What is the probability of selling at least 2 houses? e. What is the probability of selling 1 or 2 houses? f. What is the probability of selling less than 3 houses