Letchford, S. <br/><br/>
Business mathematics and statistics / 
by S. Letchford 
 - 2nd ed. 
 - London :  Cassell,  1977 
 - x, 546 p. :  ill. ;  22 cm. 
<br/><br/> 'A Cassell professional handbook' - cover. - With answers 
<br/><br/>Index 
<br/><br/><label>ISBN: </label>0304297607 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematical statistics<br/>Business mathematics