Introduction to Probability ans statistics / 
William Mendehall , Robert J. Beaver . 
 - 8th ed. 
 - Boston :  PWS-KENT Pub Co. ,  1991. 
 - xv,716 p,:  ill,; 
<br/><br/><label>ISBN: </label>0534982646 
<br/><br/><label>LC Class. No.: </label>QA276  / .M43 1991