What is the Average of Odd Numbers between 400 and 600?

The below workout with step by step calculation shows how to find what is the average of odd numbers between 400 and 600 manually.
step 1 Address the formula and input values.
Formula: Average = Total Sum of Numbers / Total Count of Numbers
Input values:
The odd numbers between 400 and 600 are
401, 403, 405, 407, . . . . , 595, 597, 599
Total Count of Numbers = 100

step 2 Find the sum of odd numbers between 400 and 600.
sum = 401 + 403 + 405 + . . . . + 597 + 599
= 50000

step 3 Divide the sum by 100
Average = 50000/100
= 500

500 is an average of odd numbers between 400 and 600.

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