Question 1041689
<pre><font size = 4>

The formula for the sample size is 

{{{n}}}{{{""=""}}}{{{drawing(3,20,-1,1,-1,2,locate(0,1.9,p),locate(0,2.1,"^"))}}}(1-{{{drawing(3,20,-1,1,-1,2,locate(0,1.9,p),locate(0,2.1,"^"))}}})(z<sub><font face="symbol">a/2</font></sub>/E)<sup>2</sup>

According to the empirical rule, approximately 95% of the data is within
2 standard deviations from the mean, so we will use z<sub><font face="symbol">a/2</font> = 2 

{{{n}}}{{{""=""}}}{{{0.45(1-0.45)(2/0.043)^2}}}{{{""=""}}}{{{535.4245538}}}

Edwin</pre>