please help ASAP

(a)

Prob 0 orange   = (2/8)^2  = (1/4)^3  = .0156

Prob 1 orange  =  C(3,1) * (1/4)^2 * (6/8)  = .1406

Prob 2 orange = C(3,2) *(1/4) * (3/4)^2  = .4219

Prob 3 orange  = (3/4)^3  = .4219

3rd histogram

(b)

Expected number of orange = 0 + .1406 + 2(.4219) + 3(.4219) = 2.25