A students was asked to find the arithmetic mean of the numbers 2, 9, 13, 17, 11, 5, 12, 18, 14, 8, 15 and x. He found the mean to be 13. What should be the number in place of x?

A students was asked to find the arithmetic mean of the numbers 2, 9, 13, 17, 11, 5, 12, 18, 14, 8, 15 and x. He found the mean to be 13. What should be the number in place of x?
1). 3
2). 7
3). 17
4). 32

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