SOLUTION: In a box of markers there are eight which have dried up and will not write. The box contains 15 red, 15 purple, 5 black and 10 white markers. A marker is picked at random from the

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Question 1065618: In a box of markers there are eight which have dried up and will not write. The box contains 15 red, 15 purple, 5 black and 10 white markers. A marker is picked at random from the box.
Find the probability that
a) it is red
b) it is not black
c) it is purple or white
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
P%28R%29=15%2F%2815%2B15%2B5%2B10%29=15%2F45=1%2F3
.
.
.
First find the probability that it is black,
P%28B%29=5%2F45=1%2F9
So the probability that it is not black is the complement,
P=1-1%2F9
P=8%2F9
.
.
P=P%28P%29%2BP%28W%29
P=15%2F45%2B10%2F45
P=25%2F45
P=5%2F9