1( = @ 1( > 2( > 3( 4( > 2( 45 % @ @ > > > @ > > = > 1( 180 2( 162 3 ...
1( = @ 1( > 2( > 3( 4( > 2( 45 % @ @ > > > @ > > = > 1( 180 2( 162 3 ...
1( = @ 1( > 2( > 3( 4( > 2( 45 % @ @ > > > @ > > = > 1( 180 2( 162 3 ...
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52X if inX2 ifif2 i X i60/2362072030/19109050/42540100040/316304801________2290n 2 2∑ fiXi− nxVar(x) =i=1n −12290−100×4/72Var(x) =100−1= 0/8182 222 ∑ f i X i − nx ( 20×36)+ ( 10×9)+ ( 40×25)+ ( 30×16)−100×4 / 7S === 0/818n −199. 115 . 3 (2513 . . 2 (26∑fX( X i i 124= = = 12/4) . n 10. X < M .. 1 (27∑ X 230+235 + 235 + 250+2<strong>45</strong>X = i == 239n 5∑ −22 (X X)S = i ⇒n −1( 230−239)2+ ( 235−239)2+ ( 235−239)2+ ( 250−239)2+ ( 2<strong>45</strong>−239)2= 67 / 55−1 . . 1 (28. 2 3-6-7-9 -11-147 + 9m = = 82. 4 (29: . 2 (30( = = ) . (1
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