Statistical Calculations
129
Normal Lower Tail Probability
To calculate the area under the curve to the left of z (the lower tail probability), enter the z-
value and press ]F . This function calculates the probability that a standard normal
random variable, Z, is less than z.
Figure 5
Example
The variable Z is a standard normal random variable. What is the probability that Z is less
than -1. 7. ?
Table 12-19 Probability example
Keys Display Description
\5S
.000000 Set display precision.
J7jy]F
.044565 Calculate the probability.
Figure 6 Figure 7
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