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| Teaching Since: | May 2017 |
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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
Suppose that you are told to toss a die until you have observed each of the six faces. What is the expected number of tosses required to complete your assignment? [Hint: If Y is the number of trials to complete the assignment, Y = Y1 +Y2 +Y3 +Y4 +Y5 +Y6, where Y1 is the trial on which the first face is tossed, Y1 = 1, Y2 is the number of additional tosses required to get a face different than the first, Y3 is the number of additional tosses required to get a face different than
the first two distinct faces, . . . , Y6 is the number of additional tosses to get the last remaining face after all other faces have been observed. Notice further that for i = 1, 2, . . . , 6, Yi has a geometric distribution with success probability (7 − i )/6.]
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