What is the average of even numbers from 7 to 81? Here we will show you how to calculate the average of even numbers from 7 to 81.
To find the average of the even numbers from 7 to 81, we first calculate how many even numbers there are from 7 to 81. Then, we calculate the sum of even numbers from 7 to 81. And finally, we divide the sum by the number of even numbers to get the average.
The range is from 7 to 81, and the even numbers within that range are from 8 to 80. Therefore, the first even number in the sequence is 8, and the last even number in the sequence is 80.
Step 1) Calculate the total number of even numbers from 7 to 81
Here we calculate the total number of even numbers from 7 to 81 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 = (80 - 8 + 2) ÷ 2
tot = 74 ÷ 2
tot = 37
Total even numbers from 7 to 81 = 37
Step 2) Calculate the sum of even numbers from 7 to 81
To calculate the sum of even numbers from 7 to 81, 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 = (37 ÷ 2) × (2 × 8 + (2 × (37 - 1))
sum = 18.5 × (16 + 72)
sum = 18.5 × 88
sum = 1628
Sum of even numbers from 7 to 81 = 1628
Step 3) Calculate the average of even numbers from 7 to 81
Almost done! Now we can calculate the average of even numbers from 7 to 81 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 = 1628 ÷ 37
Average = 44
Average of even numbers from 7 to 81 = 44
Average of Even Numbers Calculator
Here you can calculate the average of even numbers of a different sequence.