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1
ISMT
111
B
USINESS
S
TATISTICS
–
R
EVIEW FOR
M
IDTERM
created by Andrew Yam
Question 2 in Midterm 2005
An
urn
has
two
coins,
where
each
has
two
faces.
The
probabilities of landing heads (head faces up) for the two coins
are:
Coin 1:
lands heads with probability
½
(coin has head on one side and tail on the other side)
Coin 2:
lands heads with probability 1
(coin has heads on both sides)
You select a coin at random (each coin has probability 1/2 of
being selected). Then you toss the selected coin,
a)
What is the probability that the tossed coin lands head?
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Answer
a)
( 29
head
P
( 29 ( 29
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 Spring '09
 AnthonyChan

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