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Recitation3Solutions

# Recitation3Solutions - Steven Weber Dept of ECE Drexel...

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Steven Weber Dept. of ECE Drexel University ENGR 361: Statistical Analysis of Engineering Systems (Spring, 2008) Recitation 3 Solutions (Friday, April 18) Question 1. Consider the problem of the king, the prisoner, and the jewel, as discussed in class. Instead of 3 chests, suppose there are n chests. There are k ( 1 k n - 1 ) jewels found in the chests, and death warrants in the remaining n - k chests. The prisoner selects one of the n chests, the king then reveals the contents of m ( 1 m n - k - 1 ) of the chests with death warrants not selected by the prisoner. The prisoner then elects to stay or switch. Staying means the prisoner is given the contents of the chest she selected. Switching means the prisoner is allowed to select a chest diﬀerent from the ﬁrst selection, and is given the contents of that selected chest. Note the probability the prisoner wins a jewel if she doesn’t switch is k/n .

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Recitation3Solutions - Steven Weber Dept of ECE Drexel...

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