Respostas

2013-05-02T12:24:00-03:00

Primeiro calcula a média:

média=2+3+4+5+7+10+12/7

média=43/7

média=6,14

 

Faz a tabela de frequencia:

X1                   X1-média                        X1-média          ( X1-média)²

2                      2-6,14= -4,14                  4,14                  17,1396

3                      3-6,14= -3,14                  3,14                    9,8596

4                      4-6,14= -2,14                  2,14                    4,5796

5                      5-6,14= -1,14                  1,14                    1,2996

7                      7-6,14= 0,86                    0,86                   0,7396

10                   10-6,14= 3,86                  3,86                 14,8996

12                   12-6,14= 5,86                  5,86                 34,3396

Total                                                                                    82,8572

 

Para calcular a varincia você pega a soma de ( X1-média)² e divide pelo numero de dados;

VAR=82,8572/7

VAR=11,836

 

E o devio padrão é a raiz da Variancia;

Dp=√VAR

Dp=√11,836

Dp=3,44