Posted by AMbe on Saturday, August 4, 2012 at 10:02am.
"Four people out of five have had cold pizza for breakfast" seems to imply that the probability for success (p)=0.8.
After that, review the conditions for applicability of binomial distribution and apply accordingly. If some of the conditions are not specified, and if you believe that it is appropriate, state your assumptions and proceed accordingly.
For conditions, see:
http://www.jiskha.com/display.cgi?id=1344089015
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