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- %Aproximarea repartitiei binomiale cu repartitia normala
- %Sa se reprezinte grafic densitatea de probabilitate binomiala pentru
- %p=1/2,1/3,1/4 si n=10,30,50 si densitatea de probabilitate normala
- %corespunzatoare. Calculati probabilitatea ca x sa ia valori intre 4 si 8,
- %considerand p=1/2 si n=10. Si calculati aceeasi probabilitate aproximand
- %variabila aleatoare x cu o variabila aleatoare y cu repartitie normala.
- clc
- clear all
- help l5p2.m
- n=10;
- p=1/2;
- q=1-p;
- a=4;
- b=8;
- X=zeros(2,(n+1));
- for k=0:n
- X(1,k+1)=k;
- X(2,k+1)=factorial(n)/(factorial(k)*factorial(n-k))*p^k*q^(n-k);
- end;
- m=n*p;
- sigma=sqrt(n*p*q);
- x=[0:0.1:n];
- f=(1/(sigma*sqrt(2*pi)))*exp(-((x-m).^2)/(2*sigma^2));
- plot(X(1,:),X(2,:),'o',x,f);
- p1=sum(X(2,a+1:b+1))
- p2=normcdf(b+1/2,m,sigma)-normcdf(a-1/2,m,sigma)
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