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Suppose the random variable Y has a mean of 11 and a variance of 49. Let Z = -(Y– 11). V49 Show that uz =0. Hz =E [O (Y-D] = 0 (Round your responses to two decimal places)

Suppose the random variable Y has a mean of 11 and a variance of 49. Let Z = -(Y– 11). V49 Show that uz =0. Hz =E [O (Y-D] = 0 (Round your responses to two decimal places)

ENGR.ECONOMIC ANALYSIS
ENGR.ECONOMIC ANALYSIS
14th Edition
ISBN:9780190931919
Author:NEWNAN
Publisher:NEWNAN
Chapter1: Making Economics Decisions
Section: Chapter Questions
Problem 1QTC
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1 -(Y– 11). V49 Suppose the random variable Y has a mean of 11 and a variance of 49. Let Z = Show that = 0. Hz =E I (Y-D] = 0 %D (Round your responses to two decimal places)
Transcribed Image Text:1 -(Y– 11). V49 Suppose the random variable Y has a mean of 11 and a variance of 49. Let Z = Show that = 0. Hz =E I (Y-D] = 0 %D (Round your responses to two decimal places)
Suppose Walmart introduces an offer of a flat 20% discount on the entire bill for the purchase of any electronic item. It also offers an additional $75 discount on the entire bill for the purchase of any kitchenware item, conditional on the purchase of an electronic item. Let X denote the before-discount expenditure of a shopper who purchases both an electronics item and a kitchenware item, and let Y denote this shopper's after-discount expenditure. If denotes the standard deviation of this shopper's before-discount expenditure, the standard deviation of the after-discount expenditure of this shopper is. (Carefully enter your response as an algebraic expression, using the proper notation in the proper format.)
Transcribed Image Text:Suppose Walmart introduces an offer of a flat 20% discount on the entire bill for the purchase of any electronic item. It also offers an additional $75 discount on the entire bill for the purchase of any kitchenware item, conditional on the purchase of an electronic item. Let X denote the before-discount expenditure of a shopper who purchases both an electronics item and a kitchenware item, and let Y denote this shopper's after-discount expenditure. If denotes the standard deviation of this shopper's before-discount expenditure, the standard deviation of the after-discount expenditure of this shopper is. (Carefully enter your response as an algebraic expression, using the proper notation in the proper format.)
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