SOLUTION: A set of 9 numbers {3, 3, 4, 5, 5, 5, 6, 7, 7} has a mean of 5. Another number is added to the set and the mean becomes 6. What number is added to the set?

Question 1064027: A set of 9 numbers {3, 3, 4, 5, 5, 5, 6, 7, 7} has a mean of 5. Another number is added to the set and the mean becomes 6.
What number is added to the set?

Answer by ikleyn(52800) (Show Source): You can put this solution on YOUR website!
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A set of 9 numbers {3, 3, 4, 5, 5, 5, 6, 7, 7} has a mean of 5. Another number is added to the set and the mean becomes 6.
What number is added to the set?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1.  9*5 = 45.


2.   = 6  --->  45 + x = 60  --->  x = 15.


3.  I do not need to know that numbers are in your list.

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