Question 129

If the average of 39, 48, 51, 63, 75, 83, x and 69 is 60, then the value of x is

Solution

it is given that average of 39, 48, 51, 63, 75, 83, x and 69 = 60

average = $$\frac{Sum}{Number of Elements}$$

60 = $$\frac{Sum}{8}$$

Sum = 60 x 8 = 480

Sum = 39 +48+ 51+ 63+ 75+ 83+ x + 69 = 428 + x

428 + x = 480

x = 52

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