Assume that IQ scores are normally distributed, with a mean #mu# of 100 and standard deviation #sigma# of 15. What is the probability that a randomly selected person has an IQ score greater than 120?

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Answer 1 · 2015-02-18T15:25:14

#0.0912 or 9.12%#

I did this on a TI-83 plus:

(2nd)-Distr
Choose normalcdf from the menu

Fill in:

#(120,10^99,100,15)# and Enter

#120=# lower bound,
#10^99=# upper bound,
#100=# mean #mu#
#15=# standard deviation #sigma#