John Wiley & Sons TI-83 User Manual download pdf (Page 40)

Press the 2

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

key and then the VARS key to get to the

DISTR page.

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John Wiley & Sons TI-83 User Manual Page 40