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September 23rd, 2007, 04:54 PM   #1
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Pediatric data reveal the average child is toilet trained at 26 months, but that there is a 2 month standard deviation from this norm.

What percentage of children are toilet trained by 23 months ?
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September 24th, 2007, 06:30 PM   #2
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Assuming a normal distribution, you want
Pr{ Z < (23 - 26)/2 } where Z~N(0,1)
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