Help Please
Don't know about (a), but here's the rest
(b) P (x < 4) = [ 5 + 10 + 2 + 9 ] / 90 = 26 / 90 = 13 / 45
(c) P (x = 6) = 15 / 90 = 1 / 6
(d) P ( x ≥ 5 ) = [ 12 + 15 + 3 + 1 ] / 90 = 31 / 90
