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Conceitos Basicos de Estatistica e Probabilidade - Sistemas

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9. MEDIDAS DE DISPERSÃO OU VARIABILIDADE<br />

9.1. Variância (S 2 )<br />

S<br />

2<br />

=<br />

n<br />

∑<br />

i=<br />

1<br />

( x<br />

i<br />

−<br />

n −1<br />

x)<br />

2<br />

9.2. Desvio Padrão (S):<br />

S =<br />

2<br />

s<br />

S<br />

=<br />

n<br />

∑<br />

i=<br />

1<br />

( x<br />

i<br />

−<br />

n −1<br />

x)<br />

2<br />

9.3. Amplitu<strong>de</strong> (R):<br />

R = X max -X min

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