Question

find the mean of first five multiples of 4

Answer 1

mean = sum of observations/ Number of observations
= 4+8+12+16+20/5
= 50/5 = 10
so mean = 10

Answer 2

Mean = Sum of all observations
             ___________________
                 No. of observation
          = 4+8+12+16+20/5
          = 60/5
          = 12
Ans- The mean of first 5 multiples of 4 is 12.
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