The arithmetic mean of three numbers 3.2. The arithmetic mean of two of them is 2. 85. Find the third number.
| February 7, 2021 | education
The arithmetic mean is found as the sum of three numbers divided by 3.
The sum of all three numbers (by definition) is 3.2 * 3 = 9.6.
The sum of the two numbers is 2.85 * 2 = 5.7.
Let’s find the third number as the difference between the numbers 9.6 and 5.7.
9.6 – 5.7 = 3.9.
Answer: the third number is 3.9.
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