2. A fair die is successively rolled. Let X and Y denote, respectively, the number of rolls necessary to obtain the first 6 and the first 5. For example, suppose the results from the first 7 rolls are 3.2.5,3,1,5,6. Then X = 7 and Y = 3. Find (a) E[X]; (b) E[Y|X = 1]; (e) E[XY = 4]. Give your answers to three decimal places.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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2. A fair die is successively rolled. Let X and Y denote, respectively, the number of rolls necessary
to obtain the first 6 and the first 5. For example, suppose the results from the first 7 rolls are
3,2,5, 3, 1, 5, 6. Then X = 7 and Y = 3. Find
(a) E[X];
(b) E[Y|X = 1];
(c) E[X|Y = 4].
Give your answers to three decimal places.
Transcribed Image Text:2. A fair die is successively rolled. Let X and Y denote, respectively, the number of rolls necessary to obtain the first 6 and the first 5. For example, suppose the results from the first 7 rolls are 3,2,5, 3, 1, 5, 6. Then X = 7 and Y = 3. Find (a) E[X]; (b) E[Y|X = 1]; (c) E[X|Y = 4]. Give your answers to three decimal places.
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