find the mean of first 20 natural numbers
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The first 20 natural numbers are :-
1 , 2 , 3 ,................, 17 , 18 , 19 , 20
Mean = Sum of all observations / No. of observations
===> ( 1 + 2 + 3 + ............ + 17 + 18 + 19 + 20 ) / 20
===> 210 / 20
===> 10.5
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