In a group of 50 boys and 50 girls of high-school age, the number of calories consumed on a particular day by each person can be summarized by the following two frequency distributions:
Class interval Males Females 5000-5499 4500-4999 4000-4499 3500-3999 3000-3499 2500-2999 2000-2499 1500-1999 1000-1499 1 2 4 16 12 7 5 2 1 1 0 2 5 10 20 8 2 2 50 50

(a) compute the sample mean, median, and mode for each of the two frequency distributions

(b) compute the sample variance for each of the two frequency distributions.