Posted by rick on Tuesday, July 31, 2012 at 3:56pm.
.5/.3 = 1.67 standard deviations below mean
Look at table for normal distribution
My quick table is very rough
for z = -1.6 F(z) = .055
for z = -1.7 F(z) = .045
so about F(1.67) = about .05 or 5 %
By the way, I do not believe it. Suspect sigma much lower than 0.3 min or possibly not a normal distribution at all.
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