1.

The average of 12 numbers is X. If each number is decreased by 5, then the average becomes?1. X2. X + 53. X - 54. X - 25

Answer» Correct Answer - Option 3 : X - 5

Given:

The average of 12 numbers = X

Formula used:

Average = sum of observation/no. of observation

Calculation:

Average of the 12 numbers = X

Sum of the 12 numbers =  12X

Decrease of 1 number = 5 

Decrease of 12 numbers = 12 × 5 = 60 

Sum of the new 12 numbers = 12x - 60 

Average of new 12 numbers = (12x - 60 )/12 = x - 5

∴ The new average is x - 5.



Discussion

No Comment Found

Related InterviewSolutions