Asked by Matthew

Times for a surgical procedure are normally distributed. Method A has a mean of 28 minutes and a standard deviation of 2 minutes for completion.

What is the probability that a surgical procedure conducted by method A takes at most 33 minutes to complete?
Answered by Reiny
this is one of the best sites for your kind of question

http://en.wikipedia.org/wiki/List_of_countries_by_life_expectancy

enter
mean -- 28
SD ---2
click on below, enter 33

I get .99379
Answered by Ms. Sue
Is that site the one you meant to post?

Answered by Reiny
no, sorry, must have missed the "copy" before the "paste"
try this one ....

http://davidmlane.com/hyperstat/z_table.html
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