Expectation  unit 4 

 - Walton hall  The open university press  1984 
 - 64p. 
<br/><br/><label>ISBN: </label>033514148X  £2.95 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics<br/>Statistics
<br/><br/><label>Dewey Class. No.: </label>519.5  / EXP