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Press the 2
nd
key and then the VARS key to get to
the DISTR page.
Press the number 1 key.
Type in 1, 0, 1) to get normalpdf(1,0,1).
Press the ENTER to get .242.
To find the probability of getting a value that falls within a range of values from the standard
normal distribution you can use the normalcdf( function which stands for normal cumulative
density function. There are three different possibilities; 1) finding the probability that a number
will fall to the left of a value under the standard normal distribution 2) finding the probability
that a number will fall to the right a value under the standard normal distribution and 3) finding
the probability that a number will fall between two values under the standard normal distribution.
Example: Finding the Area to the Left
To find the area to the left of a number b, type normalcdf(−1E99, b). The E is for scientific
notation, and is located above the comma key in the sixth row (where the label appears as EE).
The point of using −1E99 is that it is a quick way of typing a very large negative number, as if
we were entering −1 million. The results of this function will give you the same values that are
on the standard normal distribution table in your elementary statistics book.
Find the probability of getting a value to the left of -1.5 on the standard normal distribution.
Press the 2
nd
key and then the VARS key to get to the
DISTR page.
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