<p>Use the following information to answer questions 78 &ndash; 80:</p><p>The following is a grading of a sample of sand</p><p>Sieve Size&nbsp;&nbsp; &nbsp;Percent passing by mass&nbsp;&nbsp; &nbsp;<br />9.5 mm&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;100&nbsp;&nbsp; &nbsp;<br />4.75 mm&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;98&nbsp;&nbsp; &nbsp;<br />2.36 mm&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;88&nbsp;&nbsp; &nbsp;<br />1.18 mm&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;68&nbsp;&nbsp; &nbsp;<br />600 &micro;m&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;45&nbsp;&nbsp; &nbsp;<br />300 &micro;m&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;15&nbsp;&nbsp; &nbsp;<br />150 &micro;m&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;5&nbsp;&nbsp; &nbsp;<br />&nbsp;</p><p>78.&nbsp;The fineness modulus of the sand is:</p>