Sure, an arithmetic mean is the average of a set of numbers, and it can be calculated by adding up all the numbers in the set and then dividing the sum by the total number of numbers in the set.

Here are the steps to find the arithmetic mean of a set of numbers using a calculator:

1. Add up all the numbers in the set.
2. Count the total number of numbers in the set.
3. Divide the sum of the numbers by the total number of numbers in the set.
4. The final result will be the arithmetic mean of the set of numbers.

Here’s an example: let’s say we have the following set of numbers: 2, 5, 9, 10, 12. To find the arithmetic mean of this set of numbers, we would do the following:

1. Add up all the numbers: 2 + 5 + 9 + 10 + 12 = 38
2. Count the total number of numbers in the set: there are 5 numbers.
3. Divide the sum of the numbers by the total number of numbers in the set: 38 / 5 = 7.6

So the arithmetic mean of the set of numbers 2, 5, 9, 10, 12 is 7.6.