The arithmetic mean of three numbers is 3.2. The arithmetic mean of two numbers is 2.85. Find the third number.
| March 19, 2021 | education
We know that the arithmetic mean of three numbers is 3.2, therefore, their sum is:
3.2 * 3 = 9.6.
We know that the arithmetic mean of two numbers is 2.85, therefore, their sum is:
2.85 * 2 = 5.7.
If we find the difference between the sum of three numbers and the sum of two numbers, then we will find what the third number is equal to:
9.6 – 5.7 = 3.9.
Answer: 3.9.
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