The below workout with step by step calculation shows how to find what is the average of numbers from 1000 to 1500 manually.
step 1 Address the formula and input values.
Formula: Average = Total Sum of Numbers / Total Count of Numbers
Input values:
The numbers from 1000 to 1500 are
1000, 1001, 1002, 1003, . . . . , 1498, 1499, 1500
Total Count of Numbers = 501
step 2 Find the sum of numbers from 1000 to 1500.
sum = 1000 + 1001 + 1002 + . . . . + 1499 + 1500
= 626250
step 3 Divide the sum by 501
Average = 626250/501
= 1250
1250 is an average of numbers from 1000 to 1500.