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# week4 notes 200

Penn State

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notes week 4
COURSE
PROF.
Marilyn Blanco
TYPE
Class Notes
PAGES
1
WORDS
KARMA
25 ?

## Popular in Supply Chain Management (business statistics)

This 1 page Class Notes was uploaded by Evangelos Katradis on Sunday February 14, 2016. The Class Notes belongs to 200 at Pennsylvania State University taught by Marilyn Blanco in Fall. Since its upload, it has received 20 views. For similar materials see Supply Chain Management (business statistics) in Business at Pennsylvania State University.

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Date Created: 02/14/16
**week of test** no class friday**** limited notes** Extension of Topic 6: The Expected Value concept: ­ the symbol “E” denotes the average value of  hence: mu= E(x)=mean of x Variance of a Discrete Random Variable: (when x is a random variable) ­(sigma)^2=Variance of X= Var(x) ­(sigma)^2=  sum of (x­mu)^2 X P(x) ­P(x)= Probability of X ­since mu= E(x)= sum of x X P(x) ­Var(x)= (sigma)^2= sum of [x­E(x)]^2 X P(x) Standard Deviation of a Discrete Random Variable: (the st. dev. of a random variable X is the pos. square root of the var of X) ­sigma= st.dev. of X= SD(x) ­SD(x)= sigma= sq. root of {sum of ([x­E(x)]^2) P(x)}

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