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To find the score that is associated with the lowest 1% of the area under the normal distribution
we use invNorm( .
Press the 2
nd
key and then the VARS key to get to the
DISTR page.
Press the number 3 key.
Type in .01, 54, 8).
Press the ENTER key.
We should offer to replace defective calculators up to 35
months old.
Example: SAT Scores
Given that the 2002 SAT scores were normally distributed with mean 1020 and standard
deviation 153, what is the 90th percentile score?
invNorm(0.90, 1020, 153) = 1216.
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