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Lec08 Mean and Variance

Lec08 Mean and Variance - 1 Mean and Standard Deviation of...

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Mean and Standard Deviation of a Random Variable 1

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Mean: Measure of Central Tendency 2 Guess the Mean Is this mean higher or lower x 0 1 2 f(x) .15 .70 .15 x 0 1 2 100 f(x) .14 .70 .14 .02
Expected Value of discrete r.v. X 3 Called: Expected Value of X Mean of X E(X) μ

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Calculate the Mean 4 Calculate the Mean Calculate the Mean x 0 1 2 f(x) .15 .70 .15 x 0 1 2 100 f(x) .14 .70 .14 .02
Standard Deviation: Measure of Variation 5 SD is 0.55 Is SD of this pdf higher or lower How about SD of this pdf - higher or lower x 0 1 2 f(x) .15 .70 .15 x 0 1 2 100 f(x) .14 .70 .14 .02 x 0 1 2 3 f(x) .14 .70 .14 .02

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How to calculate the Standard Deviation of discrete r.v. X 6
Calculate Standard Deviation 7 SD is 0.55 SD= SD = x 0 1 2 f(x) .15 .70 .15 x 0 1 2 100 f(x) .14 .70 .14 .02 x 0 1 2 3 f(x) .14 .70 .14 .02

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What is difference between "average" and mean? 8 Mean ==== Population mean is a population parameter

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