Question

what is the mean of the first 20 positive even numbers?​

Answer 1

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$mean = (2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20 + 22 + 24 + 26 + 28 + 30 + 32 + 34 + 36 + 38 + 40) \div 20$

Mean = 21

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Answer 2

First 20 positive even numbers -

2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,

32,34,36,38,40

Mean - Sum of observation/ No. of observation

Mean - 2 + 4 + 6+ 8 + 10 + 12+ 14 + 16 + 18 + 20 + 22 + 24 + 26 + 28 + 30 + 32 + 34 + 36 +38, + 40/ 20

Mean - 420/20 = 21