The below workout with step by step calculation shows how to find what is the average of numbers from 101 to 500 manually.
step 1 Address the formula and input values.
Formula: Average = Total Sum of Numbers / Total Count of Numbers
Input values:
The numbers from 101 to 500 are
101, 102, 103, 104, . . . . , 498, 499, 500
Total Count of Numbers = 400
step 2 Find the sum of numbers from 101 to 500.
sum = 101 + 102 + 103 + . . . . + 499 + 500
= 120200
step 3 Divide the sum by 400
Average = 120200/400
= 300.5
300.5 is an average of numbers from 101 to 500.