What is the average of even numbers from 128 to 139? Here we will show you how to calculate the average of even numbers from 128 to 139.
To find the average of the even numbers from 128 to 139, we first calculate how many even numbers there are from 128 to 139. Then, we calculate the sum of even numbers from 128 to 139. And finally, we divide the sum by the number of even numbers to get the average.
The range is from 128 to 139, and the even numbers within that range are from 128 to 138. Therefore, the first even number in the sequence is 128, and the last even number in the sequence is 138.
Step 1) Calculate the total number of even numbers from 128 to 139
Here we calculate the total number of even numbers from 128 to 139 by entering the first and last even number in the sequence into our formula. Here is the formula and the math:
tot = (last - first + 2) ÷ 2
tot = (138 - 128 + 2) ÷ 2
tot = 12 ÷ 2
tot = 6
Total even numbers from 128 to 139 = 6
Step 2) Calculate the sum of even numbers from 128 to 139
To calculate the sum of even numbers from 128 to 139, you enter the total even numbers (tot) from Step 1 and the first even number in the sequence into our formula. Here is the formula and the math:
sum = (tot ÷ 2) × (2 × first + (2 × (tot - 1))
sum = (6 ÷ 2) × (2 × 128 + (2 × (6 - 1))
sum = 3 × (256 + 10)
sum = 3 × 266
sum = 798
Sum of even numbers from 128 to 139 = 798
Step 3) Calculate the average of even numbers from 128 to 139
Almost done! Now we can calculate the average of even numbers from 128 to 139 by dividing the sum of even numbers from Step 2 by the total even numbers from Step 1. Here is the formula, the math, and the answer:
Average = sum ÷ tot
Average = 798 ÷ 6
Average = 133
Average of even numbers from 128 to 139 = 133
Average of Even Numbers Calculator
Here you can calculate the average of even numbers of a different sequence.