The normal distribution  unit 9 

 - Walton hall  The open university press  1984 
 - 48p. 
<br/><br/><label>ISBN: </label>0335141536  £2.95 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics<br/>Statistics
<br/><br/><label>Dewey Class. No.: </label>519.5  / NOR