Question

5,6,7,8,8, 10, 10, 10, 12, 12, 13, 19, 19,19,20
Verify your answers by actual calculationsby arithmetic mean​

Answer 1

$arithmetic \: mean = \frac{5 + 6 + 7 + 8 + 8 + 10 + 10 + 10 + 12 + 12 + 13 + 19 + 19 + 19 + 20}{15}$