<PRE><B>Question 864073</B>
&lt;pre&gt;&lt;font face = &quot;consolas&quot; color = &quot;indigo&quot; size = 3&gt;&lt;b&gt;
Hi
ME = {{{2.326(10/sqrt(500))}}}
CI: 15-ME &lt; u &lt;  15 + ME

90%	z =1.645
92%	z = 1.751
95%	z = 1.96
98%	z = 2.326
99%	z = 2.576
</PRE>