To find the mean divide the sum of the values by the total number of values.
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Practice makes perfect
The mean is often referred to as the average. It is used to describe the middle point in a set of data that does not have an outlier. To find the mean, we divide the sum of the values by the total number of values.
Mean: Sum of the values/Total number of values
Let x be the number of the salesman's sales. We can write an expression for the sum of the grades and simplify it.
We know that the total number of values is 10. Therefore, to find an expression for the mean we must divide the obtained expression by 10.
Mean: 125+x/10
Finally, since we want the average — or mean — to be 14, the above expression must equal 14. Let's write an equation for this and then solve for x.
