Question

You have 30 slips of paper,five labeled -4, five labeled 4, four labeled -3, four labeled 3, three labeled -2, three labeled 2, two labeled -1, two labeled 0, and two labeled 1.
a) If each slip of paper has the same probability of being drawn, find the probability of getting -4,-3,-2,-1,0,1,2,3,4, and find the mean and the variance of this distribution.