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The mean of four numbers is 18 . H one of the four numbers is removed, the mean of the three remaining numbers is 17 . What is the value of the number that was removed?

Ask by Fitzgerald Murphy. in the United States
Jan 23,2025

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The number removed is 21.

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The Deep Dive

To find the value of the removed number, let's first determine the total of the four numbers. Since the mean is 18, the total sum of the four numbers is 4 times 18, which equals 72. Now, when one number is removed, the mean of the remaining three numbers becomes 17. Thus, the total of the remaining three numbers is 3 times 17, which equals 51. To find the number that was removed, subtract the total of the remaining three numbers from the total of the four numbers: 72 - 51 = 21. Therefore, the number that was removed is 21.

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