//Example 3.26 The mean of a certain normal distribution is equal to the standard error
clc;
clear;
n=49;
disp("Mean = S.E in sample size of 25 i.e s_d=5(m)",49,"Total Sample = ");
disp(1-0.9192,"Probab. of P(x<0), when n=40. Since the population is normal = P(x<0)=");