Question

5. An um contains 50 marbles, 40 blue ones and

10 yellow ones
(a) What is the probability of drawing a blue
marble
(b) If 5 yellow marbles are removed from the
urn what is the chance now of drawing a
vellow marble​

Answer 1

(a) 40/50 = 45

(b) If 5 yellow marbles are removed, there are 45 marbles left. So we have 5/45 = 1/9.