Find the arithmetic mean of the numbers 12, 15, 18, 21, and 24.

Find the arithmetic mean of the numbers 12, 15, 18, 21, and 24.

Step 1: Write down the numbers you want to find the mean of: 12, 15, 18, 21, and 24.
Step 2: Add all the numbers together: 12 + 15 + 18 + 21 + 24.
Step 3: Calculate the sum: 12 + 15 = 27, then 27 + 18 = 45, then 45 + 21 = 66, and finally 66 + 24 = 90.
Step 4: Count how many numbers there are. In this case, there are 5 numbers.
Step 5: Divide the total sum (90) by the number of numbers (5): 90 / 5.
Step 6: Calculate the division: 90 divided by 5 equals 18.

Arithmetic Mean – The arithmetic mean is calculated by summing a set of numbers and dividing by the count of those numbers.