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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?

Question:

What number is added to the set?

A
15

Explaination

The total sum of the 9 numbers is $5116_w82_h14.png$

The total sum of the 10 numbers is $1953_w90_h13.png$

45 + number added = 60.

Number added is 60 - 45 = 15.

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