The number is 72, the second number is 80% of it, and the third is 7/8. Find the arithmetic mean of these numbers.

univerkov | September 5, 2021 | education

Let’s find the second number:

1) 72 * 80/100 = 5760/100 = 57.6

Let’s find the third number:

2) 57.6 * – 7/8 = 576/10 * – 7/8 = 72 * – 7/10 = – 504/10 = – 50.4

Let’s find the arithmetic mean of these numbers:

3) (72 + 57.6 – 50.4) / 3 = 79.2 / 3 = 26.4

Answer: The arithmetic mean of these numbers is 26.4.

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