<PRE><B>Question 1173725</B>
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If the restaurant is full, &amp;nbsp;then &amp;nbsp;(according to the condition), &amp;nbsp;it is not a probability problem, &amp;nbsp;at all.


The mean is always  &amp;nbsp;0.42 &amp;nbsp;of &amp;nbsp;80.


Standard deviation is &amp;nbsp;0 &amp;nbsp;(zero).



If you expect to get another answer, &amp;nbsp;then &amp;nbsp;REVISE &amp;nbsp;your condition.



Actually, &amp;nbsp;what is written in the post, &amp;nbsp;IS &amp;nbsp;NOT &amp;nbsp;WHAT &amp;nbsp;YOU &amp;nbsp;WANTED &amp;nbsp;to write.



And definitely &amp;nbsp;is not what &amp;nbsp;SHOULD &amp;nbsp;BE &amp;nbsp;WRITTEN in it . . . 



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