exponential different mu

x = 0:100;
mu1 = 10;
mu2 = 5;
mu3 = 15;

y1 = exppdf(x,mu1);
y2 = exppdf(x,mu2);
y3 = exppdf(x,mu3);

plot(x,y1,'r');
hold on;
plot(x,y2,'g');
plot(x,y3,'b');
title('EXPONENTIAL DISTRIBUTION CURVE FOR DIFFERENT mu');
legend('mu=10','mu=5','mu=15');