<PRE><B>Question 90848</B>
ORIGINAL QUESTION: Find the percent of the total area under a normal curve that is contained within the specified interval. Between the mean and 1.64 standard deviations from the mean 
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Follow this key sequence on your TI-83:
START
DISTR
Select #2 normal(cdf
Input: 0 comma 1.64
ENTER
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You should get .4494974302 as an answer.
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Cheers,
Stan H.</PRE>