Holt Mcdougal Larson Pre-algebra: Student Edition 2012
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN: 9780547587776
Author: HOLT MCDOUGAL
Publisher: HOLT MCDOUGAL
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Question
2.
Alice has three unfair coins. The first coin shows heads with proba-
bility 0.3 and tails with probability 0.7. The second coin shows heads with
probability 0.9 and tails with probability 0.1. The third coin shows heads with
probability 0.4 and tails with probability 0.6.
First, Alice throws a dice. If the dice yields a 1 or 2, Alice tosses the
first coin. If the dice yields a 3, Alice tosses the second coin. If the dice yields
a 4 or 5, or 6, Alice tosses the third coin.
(i) What is the probability of the following event: as a result of
throwing the dice and then tossing a coin, tails appear.
[7 Marks]
Assume a coin shows tails. What is the probability that Alice
(ii)
tossed
(a)
the first coin;
(b)
the second coin;
Total marks 11
(c)
the third coin?
[4 Marks]
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Transcribed Image Text:2. Alice has three unfair coins. The first coin shows heads with proba- bility 0.3 and tails with probability 0.7. The second coin shows heads with probability 0.9 and tails with probability 0.1. The third coin shows heads with probability 0.4 and tails with probability 0.6. First, Alice throws a dice. If the dice yields a 1 or 2, Alice tosses the first coin. If the dice yields a 3, Alice tosses the second coin. If the dice yields a 4 or 5, or 6, Alice tosses the third coin. (i) What is the probability of the following event: as a result of throwing the dice and then tossing a coin, tails appear. [7 Marks] Assume a coin shows tails. What is the probability that Alice (ii) tossed (a) the first coin; (b) the second coin; Total marks 11 (c) the third coin? [4 Marks]
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