Unformatted text preview: The department has to pay a $5 delivery fee (the delivery fee does not depend on the number of boxes ordered). Then the monthly “paper” bill is Y = 25 ⋅ X + 5. Find Anytown College Statistics & Probability Department’s average monthly “paper” bill and its standard deviation. E ( X ) = ∑ ⋅ x x f x all ) ( = 2.4 . [ ] [ ] 2 all 2 2 2 X E ) ( X E X E X Var ) ( ) ( ) ( ) (== ∑ ⋅ x x f x = 7.2 ( 2.4 ) 2 = 1.44 . SD ( X ) = 44 . 1 = 1.2 . E ( Y ) = 25 ⋅ E ( X ) + 5 = 25 ⋅ 2.4 + 5 = $65 . SD ( Y ) =  25  ⋅ SD ( X ) = 25 ⋅ 1.2 = $30 ....
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 Spring '08
 Kim
 Statistics, Normal Distribution, Probability, Standard Deviation, Anytown College, Probability Department, Anytown College Statistics

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