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An item is selected randomly from a collection labeled 1,2, ..., n. Denote its label by X. Now select an integer Y uniformly at random from {1,..., X}. Find: a) E(Y); b) E(Y²); [Hint: You may use [₁i² = n(n+1)(2n+1) and C=₁i = n(n+1) c) SD(Y); d) P(X + Y = 2).

An item is selected randomly from a collection labeled 1,2, ..., n. Denote its label by X. Now select an integer Y uniformly at random from {1,..., X}. Find: a) E(Y); b) E(Y²); [Hint: You may use [₁i² = n(n+1)(2n+1) and C=₁i = n(n+1) c) SD(Y); d) P(X + Y = 2).

A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
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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An item is selected randomly from a collection labeled 1, 2,..., n. Denote its label by X. Now select an integer Y uniformly at random from {1,..., X}. Find: a) E(Y); b) E(Y²); [Hint: You may use Ei=1 1² = c) SD(Y); d) P(X+Y = 2). n(n+1)(2n+1) and _₁ i = n(n+¹)]
Transcribed Image Text:An item is selected randomly from a collection labeled 1, 2,..., n. Denote its label by X. Now select an integer Y uniformly at random from {1,..., X}. Find: a) E(Y); b) E(Y²); [Hint: You may use Ei=1 1² = c) SD(Y); d) P(X+Y = 2). n(n+1)(2n+1) and _₁ i = n(n+¹)]
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