Correct Answer - Option 2 : 89
Given:
The sum of Seven consecutive even numbers is 644
Formula used:
Average = Sum of unit/number of units
Calculation:
Sum of 7 consecutive even number is 644
Average of them = 644/7 = 92
And as it is an average of 7 consecutive even numbers then this average must be the 4th number of the set.
So, the first 4 numbers of the set must be = 86, 88, 90 and 92
Average of first 4 digit = (86 + 88 + 90 + 92)/4
⇒ 89
∴ The average of first 4 consecutive numbers of the set is 89