What is the mean 3 -10 -2 13 12?

To find the mean of the numbers 3, -10, -2, 13, and 12, add them together: ( 3 + (-10) + (-2) + 13 + 12 = 16 ). Then, divide the sum by the number of values, which is 5: ( 16 / 5 = 3.2 ). Therefore, the mean is 3.2.