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The mean of 19 numbers is 17. An extra number is included and the mean increases to 23. What is the extra number?
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The mean of 19 numbers is 17. An extra number is included and the mean increases to 23. What is the extra number?

User Azi
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1 Answer

5 votes

Answer:

Extra number = (23×20) - (19×17)

= 137

User Dbellizzi
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