Consider the following probabilities

x -4 -3 -2 -1 0 1 2 3 4

p(x) .02 .07 .10 -- .30 .18 .10 .06 .02

What is the mean ?

a)

-0.01

b)

0.00

c)

0.01

d)

0.02

e)

-0.02