Create Day-5_NormalDistribution-I.cpp

Day-5/Day-5_NormalDistribution-I.cpp

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+
+
+#include <cmath>
+#include <cstdio>
+#include <vector>
+#include <iostream>
+#include <algorithm>
+using namespace std;
+
+
+/*
+    given,
+        mean = 20 hrs
+        std_d = 2 hrs
+*/
+
+double normal_dist(double m, double sd, double x)
+{
+    //return (1/(s*(sqrt(2*3.14))))*(pow(2.17, (-((x-m)*(x-m))/(2*s*s))));
+
+    /*
+        p = 1/2*(1 + erf((x - m)/(sd*sqrt(2))));
+    */
+
+    double p = 0.5*(1 + erf((x-m)/(sd*sqrt(2.0))));
+    return p;
+}
+
+int main() {
+    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
+
+    double m = 20, sd = 2, x = 19.5, a = 20, b = 22;
+
+    double p1 = normal_dist(m, sd, x);
+    double p2 = normal_dist(m, sd, b) - normal_dist(m, sd, a);
+
+    printf("%0.3f\n%0.3f", p1, p2);
+
+    return 0;
+}
+
+
+