Explanation

Step 1 of 2 :

Write down the arithmetic mean and total count of numbers

Here it is given that the arithmetic mean of six numbers is 4.5

Arithmetic mean = 4.5

Total count of numbers = 6

Step 2 of 2 :

Calculate the total sum of six numbers

The total sum of six numbers

= Arithmetic mean × Total count of numbers

= 4.5 × 6

= 27