plotting the density function and cumulative distribution function?

After a series of investigation, the lateral resisrance of a small building frame is to found be randomly distributed with the following probability density function, fR(r):

fR(r)= (3/500)*(r-10)*(20-r)

 10 <= r <= 20

=0 elswhere

how can we plot the density function fR(r) and cumulative distribution function FR(r)?

Answer 1

[Wayne King]

 r = 10:0.01:20;
 FR = -(r.*(r.^2-45*r+600))/500+5;
 % PDF
 fR= (3/500)*(r-10).*(20-r);
 % CDF
 FR = -(r.*(r.^2-45*r+600))/500+5;
 subplot(211)
 plot(r,fR); title('PDF');
 subplot(212)
 plot(r,FR); title('CDF');

[omur]

thank you so much