20.
22+21+19+19+19 = 100.
100 divided by the amount of numbers, which is 5, equals 20.
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mean = the sum of 23, 19, 26, 17, 21, 24, 22 divided by 7 = 152/7 =21.71
mean = 19.833... median = 19.5 mode = 19
(21 + 21 + 19 + 19)/4 = 20
2,870,795,128,037,760 or approx 2.871*1015
22