12.07.2015 Views

ESERCIZIO 1.1 I dati che seguono si riferiscono al periodo di ...

ESERCIZIO 1.1 I dati che seguono si riferiscono al periodo di ...

ESERCIZIO 1.1 I dati che seguono si riferiscono al periodo di ...

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Misure <strong>di</strong> <strong>di</strong>sper<strong>si</strong>oneVarianzaEsercizi <strong>di</strong> Statisticaxk kf ( )clas<strong>si</strong>x k− x ( x x) 22k− ( xk− x) ⋅ fk[ 40 − 45 ) 42,5 2 -19.875 395.02 790.03[ 45 − 50 ) 47,5 4 -14.875 221.27 885.06[ 50 − 55 ) 52,5 6 -9.875 97.52 585.09[ 55 − 60 ) 57,5 7 -4.875 23.77 166.36[ 60 − 65 ) 62,5 4 0.125 0.02 0.06[ 65 − 70 ) 67,5 6 5.125 26.27 157.59[ 70 − 75 ) 72,5 4 10.125 102.52 410.06[ 75 − 80 ) 77.5 4 15.125 228.77 915.06[ 80 − 85 ) 82.5 3 20.125 405.02 1215.0540 5124.382( xi− x) 5124.3822s = ∑ = = 131. 39kgn −139Deviazione standard( xi− x)∑ s =n −1Coefficiente <strong>di</strong> variazione11.46c . v.= ⋅100≅62.3752=131.39 = 11.46 kg18.4%19

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