n=10000;%%模拟的次数
countend=0;%%符合博主条件的模拟次数
for mu=53:73
    for sigma=1:12  
        count=0;%%中间临时比较值
        for i=1:n
            chengji=normrnd(mu,sigma,1,95);chengji2=[74 60.33];
            chengji=[chengji,chengji2];
            chengji=sort(chengji);
            if (chengji(94)==74)&(chengji(68)>60.33)%%判断计数规则
                count=count+1;
            end
        end
        if countend<count
            countend=count;
            muend=mu;sigmaend=sigma;
        end
    end
end
x0=muend+sigmaend*norminv(1-30/97,0,1);%%%%最低pass分数线