note BrowserUk <blockquote><i> the expectation value is simply 1e6 * P(1) = 1e6 * 1e6/2**32 = 232.83 ... the standard deviation is simply the square root of the expectation value, so 15.5. </i></blockquote> <p>Based upon a run of 100 samples, that seems to match quite nicely:<code> C:\test>bitvec2 -N=100 100 Mean: 230.95 stddev:14.75 </code> <P>I'm doing a run of 1000 samples, and if that shows no surprises, I'll be taking your figures as read and basing my testing upon it. <p>Thank you. <P>Update: The 1000 sample run marries well (good enough):<code> C:\test>bitvec2 -N=1000 1000 Mean: 233.39 stddev:15.79 </code> <div class="pmsig"><div class="pmsig-171588"> <hr /> <font size=1 > <div>With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'</div> <div>Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.</div> <div>"Science is about questioning the status quo. Questioning authority". </div> <div>In the absence of evidence, opinion is indistinguishable from prejudice. </div> </font> </div></div> 1015959 1016005