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If the mean of the data 9, 17, 18, 14, x...

If the mean of the data 9, 17, 18, 14, x, 16, 15, 11 and 12 is x, then find the value of x.

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To find the value of \( x \) given that the mean of the data set \( 9, 17, 18, 14, x, 16, 15, 11, 12 \) is equal to \( x \), we can follow these steps: ### Step 1: Write down the formula for the mean. The mean (average) of a set of numbers is calculated by dividing the sum of all the numbers by the total count of the numbers. \[ \text{Mean} = \frac{\text{Sum of all observations}}{\text{Number of observations}} \] ...
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