Using the company record of last 500 working days the manager of the company has summerized the number of cars sold per day as follow .

http://i301.photobucket.com/albums/n...untitled-2.jpg

(a)Construct PDF and CDF of the number of cars sold (say, Y)

(b)Compute the E(Y) and V(Y) and SD

(c)Find the number of cars sold less than or equal to 50%that is the QnI could not answer

Can somebody help me ?