Correct option is B
Given:
Number of values = 7
Original average = 43
Each number is decreased by 7
Formula Used:
Sum of numbers = Average Number of values
Solution:
Sum of original numbers = Original average Number of values
Sum of original numbers = 437 = 301
Since each of the 7 numbers is decreased by 7, the total decrease in the sum is 7 7 = 49.
Sum of new numbers = Sum of original numbers - Total decrease
Sum of new numbers = 301 - 49 = 252
New average = = 36
Therefore, the new average will be 36.
Alternative Solution:
If each number in a set is decreased by the same value, the average will also decrease by that value.
New average = Original average - Decrease in each number
New average = 43 - 7 = 36
Option (B) is right.
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