Calculate the mean, median, and mode for each of the following populations of numbers:
(a) 17, 23, 19, 20, 25, 18, 22, 15, 21, 20 (Population)
MEAN: 20.0
MEDIAN: 20.0
MODE: 20
(b) 505, 497, 501, 500, 507, 510, 501 (Population)
MEAN: 503.0
MEDIAN: 501.0
MODE: 501