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Nthato has two tickets to the rugby, 3 of his friends would like to go to the rugby but he can only give one of them a ticket so they decide that they will put 8 red marbles and one blue marble into a bag. Whoever draws the blue marble will go with to the rugby. The marbles that have been drawn remain out of the bag.
a) What is the probability of drawing the blue marble in the first draw?
b) What is the probability of drawing the blue marble after four red marbles have been
removed?
c) What is the probability of drawing a red marble if 2 red marbles have been removed?
d) What is the probability of drawing a blue marble once one has been removed from the
bag?
in Grade 11 Maths Literacy by Diamond (38,542 points) | 14 views

1 Answer

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a)    Probability of drawing the blue marble ∶ 1/9 = 0.11

b)    Probability of drawing the blue marble after four red marbles have been removed (blue) : 1/5 = 0.20

c)    Probability of drawing a red marble if 2 red marbles have been removed (red): 6/7 = 0.86

d)  Probability of drawing a blue marble once one has been removed from the bag 0
by Silver Status (28,718 points)

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