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+//Caption: Normal Distribution
+//Example6.9
+//Page185
+clear;
+clc;
+//Example6.9(a):Probability that the monthly income < Rs.11,000
+X = 11000;
+Mean = 10000;
+Std = 2000;
+n = 200; //sample number of respondents
+[P,Q]=cdfnor("PQ",X,Mean,Std)//Cumulative normal distribution
+disp(P,'The probability that the monthly income is < Rs.11,000 is =')
+disp(n*P,'The number of respondents having income is less than Rs.11,000 =')
+
+//Example6.9(b): Probability that the monthly income > Rs.12,000
+X = 12000;
+[P,Q]=cdfnor("PQ",X,Mean,Std)//Cumulative normal distribution
+disp(Q,'The probability that the monthly income is > Rs12,000 is =')
+disp(n*Q,'The number of respondents having income is greater than Rs.12,000 =')
+
+//Example6.9(c): Probability that the monthly income is in between Rs.7,000 and
+//Rs.11,200
+X1 = 11200;
+X2 = 7000;
+[P1,Q1]=cdfnor("PQ",X1,Mean,Std);
+[P2,Q2]=cdfnor("PQ",X2,Mean,Std);
+disp(P1-P2,'The probability that the monthly income in between Rs.7,000 & Rs.11,200 is =');
+disp(n*(P1-P2),'The number of respondents having income in between Rs.7,000 & Rs.11,200 is =')
+//Result
+//The probability that the monthly income is < Rs.11,000 is =   
+// 
+//    0.6914625  
+// 
+// The number of respondents having income is less than Rs.11,000 =   
+// 
+//    138.29249  
+// 
+// The probability that the monthly income is > Rs12,000 is =   
+// 
+//    0.1586553  
+// 
+// The number of respondents having income is greater than Rs.12,000 =   
+// 
+//    31.731051  
+// 
+// The probability that the monthly income in between Rs.7,000 & Rs.11,200 is =   
+// 
+//    0.6589397  
+// 
+// The number of respondents having income in between Rs.7,000 & Rs.11,200 is =   
+// 
+//    131.78794
+\ No newline at end of file