John Wiley & Sons TI-83 User Manual download pdf (Page 41)

Press the number 2 key.

Type in the number -1.

Press the 2

nd

key and then the , (comma) key to get the

exponential sign E.

Type in 99, 0, 1) after the E.

Press the ENTER key.

The probability is .159.

Example: Finding the Area to the Right

To find the area to the right of a number a, type normalcdf(a, 1E99). 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 positive number, as if we

were entering 1 million.

Find the probability of getting a value to the right of 2.27 on the standard normal distribution.

Press the 2

nd

key and then the VARS key to get to the

DISTR page.

Press the number 2 key.

Type in the number 2.27 followed by a comma.

Type in the number 1.

Press the 2

nd

key and then the , (comma) key to get the

exponential sign E.

Type in 99, 0, 1) after the E.

Press the ENTER key.

The probability is .012.

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