Posted by **Akhtar** on Wednesday, May 4, 2011 at 7:36am.

Hello,

If mean is say 33 seconds and standard deviation under root of 10.45 then prob of less than 18 seconds results in Z = -4, but the tables for norm distribution don't have 4 in them.. how to get round this problem?

- probability -
**PsyDAG**, Wednesday, May 4, 2011 at 1:49pm
P < .0001

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