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Fine bar( u) , if Sigma f(i) u(i ) 252 ...

Fine `bar( u)` , if `Sigma f_(i) u_(i ) 252` and `Sigmaf_(i) = 420`

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`bar( u ) = ( Sigma f_(i) u _(i))/( Sigmaf_(i))`
` = ( 252 )/( 420 ) = 0.6 ` `:. bar( u ) = 0.6 `
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