1.

If the mean of 6, 4, 7, ‘a’ and 10 is 8. Find the value of ‘a’

Answer»

No. of terms = 5 

Mean = 8 Sum of numbers = 8 x 5 = 40 .   (i) 

But, sum of numbers = 6+4+7+a+10 = 27+a ..(ii) From (i) and (ii) 

27+a = 40 

a = 13



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