What is the average of the first 639 natural numbers?

The average of the first 639 natural numbers

Here we will define and show you the formula and the math to calculate the average of the first 639 natural numbers.

The first 639 natural numbers are the whole numbers (integers) that start with 1 and end with 639. To make a list of the first 639 natural numbers, you simply count up to 639.

To get the average of those 639 numbers, you add them up and then divide the sum by 639. 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 = 639 in our formula, we get the average of the first 639 natural numbers. Here is the math and the answer:

avg = ((n × (n + 1)) ÷ 2) ÷ n
avg = ((639 × (639 + 1)) ÷ 2) ÷ 639
avg = ((639 × 640) ÷ 2) ÷ 639
avg = (408960 ÷ 2) ÷ 639
avg = 204480 ÷ 639
average = 320

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