Answers

2016-01-22T19:40:07+05:30
the first five multiples of 3 are 
3 , 6 , 9 , 12 and 15
mean = (sum of all no.s) / no. of numbers 
          = (3+6+9+12+15)/5
          = 9
therefore the mean of 1st 5 multiples of 3 is 9

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3,6,9,12,15 are the the first five multiples 
mean number of observations /sum of observations 3+6+9+12+15/5=9