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Trigonometry (MindTap Course List)

Trigonometry (MindTap Course List)

10th Edition

ISBN:9781337278461

Author:Ron Larson

Publisher:Ron Larson

Chapter6: Topics In Analytic Geometry

Section6.4: Hyperbolas

Problem 5ECP: Repeat Example 5 when microphone A receives the sound 4 seconds before microphone B.

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Question

Suppose X and Y are two random variables with E[X] = 1, Var (X) = 4, E[Y ] = -1,
Var (Y)
4, and Cov (X, Y) = 1. Find the standard deviation of (X - Y).
=
(a) 2
(b) √2
(c) 6
(d) √6
(e) None of the above

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