19 + 24 + 20 = 63/3 = 21
The average of the three numbers is 21.
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The average is 18.
22 + 24 + 28 + 25 + 20 + 19 = 138
20.37 is the mean.
All the numbers are composite except the ones in bold: 18 19 20 21 22 23 24 25.
21.8Simply add them all up, and then divide by how many numbers you have.