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The mean of seven numbers is 12.0. When one new number is added , the average of eight numbers becomes 12.5 . What is the new number?

The mean of seven numbers is 12.0. When one new number is added , the average of eight numbers becomes 12.5 . What is the new number?
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4 votes
The mean of seven numbers is 12.0. When one new number is added , the average of eight numbers becomes 12.5 . What is the new number?

User Yihe
by
8.8k points

2 Answers

5 votes
I agree that the answer is 16. Just plugging the number into a equation equaled to 100
User Winawer
by
8.7k points
3 votes
(12 * 7 + n)8=12.5
(12 * 7 + n)= 100
N= 16. The new number will be 16. Hope this helps. :)
User Debaghtk
by
8.0k points
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