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Mathematics 9 Online
OpenStudy (anonymous):

Probability expectations and variance... see attached picture

OpenStudy (anonymous):

OpenStudy (anonymous):

JAMES! go to chat i need ur help!

OpenStudy (jamesj):

First notice that E[(4+5X)^2] = E[16 + 40X + 25X^2] Now E is linear which means this term is E[16] + 40E[X]+25E[X^2] Now you know E[X] and you also know E[X^2] = var(X) Hence ....

OpenStudy (anonymous):

BE MY FAN!! JAMES

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