A bag contains 4 coins. You are told that one of them is a normal coin; however, 2 coins are double- headed (i.e., both sides are heads), and 1 is double-tailed. The coins cannot be distinguished unless y theck both sides of a coin. (ou pick out a coin C from the bag uniformly at random. 1) First, you toss C for 1 time. What is the probability that the lower face of the coin is heads? 2) Then, you check and see that the upper face of the coin C is a head. What is the (conditional) probability that the lower face is head? 3) Finally, you toss the coin C again. What is the probability that the lower face is still head (i.e., 2 eads in 2 tosses)? 4) If for the 2 tosses of C, you see one head and one tail for the upper face. Which coin would you quess (normal, double-headed, or double-tailed)? What is the probability that you are wrong?

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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A bag contains 4 coins. You are told that one of them is a normal coin; however, 2 coins are double-
headed (i.e., both sides are heads), and 1 is double-tailed. The coins cannot be distinguished unless yo
check both sides of a coin.
You pick out a coin C from the bag uniformly at random.
(1) First, you toss C for 1 time. What is the probability that the lower face of the coin is heads?
(2) Then, you check and see that the upper face of the coin C is a head. What is the (conditional)
probability that the lower face is head?
(3) Finally, you toss the coin C again. What is the probability that the lower face is still head (i.e., 2
heads in 2 tosses)?
(4) If for the 2 tosses of C, you see one head and one tail for the upper face. Which coin would you
guess (normal, double-headed, or double-tailed)? What is the probability that you are wrong?
Transcribed Image Text:A bag contains 4 coins. You are told that one of them is a normal coin; however, 2 coins are double- headed (i.e., both sides are heads), and 1 is double-tailed. The coins cannot be distinguished unless yo check both sides of a coin. You pick out a coin C from the bag uniformly at random. (1) First, you toss C for 1 time. What is the probability that the lower face of the coin is heads? (2) Then, you check and see that the upper face of the coin C is a head. What is the (conditional) probability that the lower face is head? (3) Finally, you toss the coin C again. What is the probability that the lower face is still head (i.e., 2 heads in 2 tosses)? (4) If for the 2 tosses of C, you see one head and one tail for the upper face. Which coin would you guess (normal, double-headed, or double-tailed)? What is the probability that you are wrong?
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