Spiegel, Murray R <br/><br/>
Probability And Statistics 

 - New Delhi;  McGraw Hill Education   2010 
 - P.23 
<br/><br/>3th. Edition 2010 
<br/><br/><label>ISBN: </label>978-0070151543 
<br/><br/><label>Dewey Class. No.: </label>519 SP86P