For Two Independent Random Variables X and Y,which of the Following

question 238

Multiple Choice

For two independent random variables X and Y,which of the following identities is always true?

• A)E(2X + 3Y)= E(X)+ E(Y)+ 5
• B)Var(2X + 3Y)=2Var(X)+ 3Var(Y)
• C)Var(2X + 3Y)= 4Var(X)+ 9Var(Y)
• D)E(2X + 3Y)= 5E(X+Y)

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Definitions:

Dynamic Roles

Roles that evolve and change in response to the situation, context, or interactions among group members or participants.

Descriptive Norms

Descriptive norms refer to the perception of what is commonly done in specific situations, guiding behavior by informing individuals about what is considered typical or normal.

Injunctive Norms

Socially accepted beliefs about what behaviors are approved or disapproved of in a society, guiding individuals on how they should behave.

Harmonizer

A role within a group characterized by efforts to reduce tension and conflict among members by encouraging cooperation and understanding.