Unformatted text preview: 3 8 3 5 4 = x x = 1.2 . c) (4) Find SD ( X ). Var ( X ) = ( ) ( ) [ ] 2 2 X E âˆ« âˆž âˆžâ‹… dx x f x = [ ] 2 2 3 2 2 2 . 1 4 3 2 3 âˆ« â‹… dx x x x = [ ] 2 2 5 4 2 . 1 4 3 2 3 âˆ« dx x x = [ ] 2 6 5 2 . 1 2 8 1 10 3 x x = ( 9.6 â€“ 8 ) â€“ 1.44 = 0.16. SD ( X ) = 16 . = 0.4 ....
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 Spring '08
 Kim
 Probability, Variance, Probability distribution, Probability theory, probability density function, dx

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