What is the average of the first 129 natural numbers?

The average of the first 129 natural numbers

Here we will define and show you the formula and the math to calculate the average of the first 129 natural numbers.

The first 129 natural numbers are the whole numbers (integers) that start with 1 and end with 129. To make a list of the first 129 natural numbers, you simply count up to 129.

To get the average of those 129 numbers, you add them up and then divide the sum by 129. We created a formula that can calculate the average of any sequence of natural numbers starting with 1. Here is the formula to calculate the average (avg) of the first n natural numbers:

avg = ((n × (n + 1)) ÷ 2) ÷ n

When we enter n = 129 in our formula, we get the average of the first 129 natural numbers. Here is the math and the answer:

avg = ((n × (n + 1)) ÷ 2) ÷ n
avg = ((129 × (129 + 1)) ÷ 2) ÷ 129
avg = ((129 × 130) ÷ 2) ÷ 129
avg = (16770 ÷ 2) ÷ 129
avg = 8385 ÷ 129
average = 65

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