What is the average of the first 9991 natural numbers?

The average of the first 9991 natural numbers

Here we will define and show you the formula and the math to calculate the average of the first 9991 natural numbers.

The first 9991 natural numbers are the whole numbers (integers) that start with 1 and end with 9991. To make a list of the first 9991 natural numbers, you simply count up to 9991.

To get the average of those 9991 numbers, you add them up and then divide the sum by 9991. 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 = 9991 in our formula, we get the average of the first 9991 natural numbers. Here is the math and the answer:

avg = ((n × (n + 1)) ÷ 2) ÷ n
avg = ((9991 × (9991 + 1)) ÷ 2) ÷ 9991
avg = ((9991 × 9992) ÷ 2) ÷ 9991
avg = (99830072 ÷ 2) ÷ 9991
avg = 49915036 ÷ 9991
average = 4996

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