Find the value of x such that the data set has the given mean.

99, 123, 104, 113, 107, x; mean 102

To find the value of x that will result in a mean of 102, we can use the formula for mean:

Mean = (sum of all the numbers)/(number of numbers)

Given that the mean is 102, we have:

(99 + 123 + 104 + 113 + 107 + x)/6 = 102

Now, let's solve for x:

99 + 123 + 104 + 113 + 107 + x = 102 * 6
536 + x = 612
x = 612 - 536
x = 76

Therefore, the value of x that will result in a mean of 102 is 76.