Suppose we toss a fair coin three times and denote outcomes in the sample space S by listing, in order, the observed Heads (h) and Tails (t). (a) Let X be the random variable counting the number of Heads, and Y be the random variable counting the number of Tails. (i) State the range of the functions X and Y , i.e., list the values they can take. (ii) Evaluate X(hht) and Y (hht). (b) Let Z be another random variable defined as Z = max{X, Y }. (i) State the range of the function Z, i.e., list the values it can take. (ii) Evaluate Z(hht). (c) Determine the probability that we see more Tails than Heads.

A First Course in Probability (10th Edition)
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ISBN:9780134753119
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Chapter1: Combinatorial Analysis
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Suppose we toss a fair coin three times and denote outcomes in the sample space S by listing, in order, the observed Heads (h) and Tails (t).

(a) Let X be the random variable counting the number of Heads, and Y be the random variable counting the number of Tails.

(i) State the range of the functions X and Y , i.e., list the values they can take. (ii) Evaluate X(hht) and Y (hht).

(b) Let Z be another random variable defined as Z = max{X, Y }.
(i) State the range of the function Z, i.e., list the values it can take.

(ii) Evaluate Z(hht).
(c) Determine the probability that we see more Tails than Heads.

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