If the average of 6, 7, 12, (x - 1) and 10 is 10, then the value of x is:

Correct option is D

Given:

Given numbers are 6,7,12,(x-1) and 10

Average = 10

Formula Used:

Average =$$\frac{Sum\ of\ observations}{Number\ of\ observations}$$​​

Solution:

Total sum of numbers = 6 + 7 + 12 + (x-1) + 10 = 34 + x

Average =$$\frac{34+x}{5} =10$$​​

34 + x = 50

x = 50 - 34 = 16