a number is missing from the following list: 3, 5, -2, -4, x. (the missing value is x.) the mean of the list is -2. what is the value of x?

a number is missing from the following list: 3, 5, -2, -4, x. (the missing value is x.) the mean of the list is -2. what is the value of x?

So we have

(3 + 5 + -2 + -4 + x)/5 = -2      multiply both sides by 5

3 + 5 + -2 + -4 + x  =  -10        simplify

2 + x   = -10                             subtract 2 from each side

x = -12