Question

Four alternative options are given for the following statement. Select the correct option from it: The mean of 6, 4, 7, x and 10 is 8. The value of x is: A. 10 B. 12 C. 14 D. 13

Answer 1

It is given that mean of 6,4,7,x and 10 is 8.
So, (6+4+7+x+10) / 5 = 8
=> (27+x) / 5 = 8
=> 27+x = 40
=>x= 40 - 27
=> x= 13
So, D is the correct option.

Answer 2

By the given condition,

$\sf \frac{6+4+7+x+10} {5} = 8 \\ \implies \sf x \: + \: 27 = 8 \\ \implies \sf x = 27 - 8 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 13$

So, D. is the correct option.