Question

find the mean first six multiple of 3

Answer 1

mean = sum of observations /no. of observations
=3+6+9+12+15+18/6
=63/6 = 1.5

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Answer 2

first six multiple of 3=3,6,9,12,15,18
mean=3+6+9+12+15+18/6
         =63/6
         =10.5