ENCONTRAR LA MEDIA VARIANZA Y DESVIACION ESTANDAR

X 1 2 3 4
P(X) 1/4 1/4 1/4 1/4

P(x)=∑_(1=0)^n▒〖xi P(xi)〗

E(x)=1(1/4)+ 2(1/4)+ 3(1/4)+ 4 (1/4)

E(x)=(1+2+3+4)/4

E(x)=10/4

Var(x)=∑_(i=1)^n▒〖X1^2+ P(x)〗

Var(x)=(1)2(1/4)+ (2)2(1/4)+ (3)2(1/4)+(4)2(1/4)

Var(x)=((1+4+9+16)/4)

Var(x)=(30/4)

DE(x)=√(Var(x))

DE(x)=√(30/4)