(21 + 21 + 19 + 19)/4 = 20
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20. 22+21+19+19+19 = 100. 100 divided by the amount of numbers, which is 5, equals 20.
19
17
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