Estatistica
Autor: Wellington | Publicado: 2011-03-31T04:32:00+13:00

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Data 28/03/2011
Estatística
Medidas de Tendência Central
Média Aritmética(x): é o quociente da divisão da soma dos valores da variável pelo nº deles.Sendo.X = médiaX1 = os valores da variávelN = nº de valoresDados não agrupados (Dados Brutos)Ex: Sabendo-se que a produção leiteira diária da vaca A, durante uma semana, foi de 10,14,13, da semana.X= Exi = 10+14+13+15+16+18+12&nbsp; =&nbsp;&nbsp; 98&nbsp;&nbsp; = 14l&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; N&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 7&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;7Dados Agrupados – 1º casp são intervalo de classeX = Exifi&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ZfiEx: Calcule a idade média dos alunos de uma classe de primeiro ano de uma determinada faculdade, em anos.
      Idade      Nº de alunos      Xifi  
      17      3      51  
      18      18      324  
      19      17      323  
      20      8      160  
      21      4      84  
      Total      50      942  

X= Exifi = 942 = 18,84 ~= 19 anos &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Zfi&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 502º Caso: com intervalo de ClasseEx.: Uma empresa de avião observou em seus registrados recentes o tempo de Mao-de-obra gasto na revisão completa de um motor de jato.X= Exi.fi&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Efi  
      Tempo de mão de obra (hrs)      Nº motores      Pm      Xifi  
      0 – 4      1      2      2  
      4 – 8      5      6      30  
      8 – 12      10      10      100  
      12 – 16       12       14      168  
      16 – 20      4      18      72  
      Total      32      /      372  

X= 372&nbsp;&nbsp;&nbsp;&nbsp; 32X = 11,63