HP 10bII+ User Manual page 142

Example 2
The variable Z is a standard normal random variable. What is the probability that z is greater
than 1.2 or less than - 1 .2?
The desired area is to the right of 1.2 and to the left of - 1 .2. Since normal distributions are
symmetrical, and the areas are the same, you can calculate the lower tail area and simply
multiply by 2.
Table 12-24 Example converting from lower tail
Keys
J7Gy]F
PG4
134 Statistical Calculations
Figure 18
Display
.1 15070
.230139
Description
Calculate the lower tail area and
store the value.
Calculates the result.