491
19. It is prime.
21+21+19+19=80
2,870,795,128,037,760 or approx 2.871*1015
16/19
16 + 16 + 16 + 17 + 18 + 18 + 18 + 19 + 19 + 20 + 20 + 20 + 21 = 238
Mean (12, 18, 19, 20, 21) = 18
491
20.37 is the mean.
21
32+14+20+18+16+31+21+16=168
19. It is prime.
21+21+19+19=80
Just over 20 18 + 19 + 21 + 23 = 81 81 / 4 (numbers) = 20.25
2,870,795,128,037,760 or approx 2.871*1015
16/19
The minimum drinking age in Connecticut was lowered from 21 to 18 in 1972. It was raised from 18 to 19 in 1982, raised from 19 to 20 in 1983, and raised from 20 to 21 in 1985.