HP 20B manual Two-Number Functions, 10I 12I, 7Inverse Probability Example

Mathematical Calculations

2.Type the number for which you want to calculate the probability, or, for the inverse, the probability for which you want the number.

3.Navigate to the appropriate function in the Probability sub-menu of the Math menu.

Table 2-6Probability Example

Keys Display Description

10I

8I

:s

Enters 10 degrees of freedom and the number for which probability is to be calculated. Opens the Math menu.

<<I

<<<<

Selects the Probability menu item and scrolls to Chi2.

Ior =

Validates the result.

Table 2-7Inverse Probability Example

Keys Display Description

10I

0.37

12I

:s

Enters 10 degrees of freedom and the probability. Opens the Math menu.

<<I

<<<<

<

Selects the Probability menu item. Scrolls to Chi2-1.

Ior =

Validates the result.

Two-Number Functions

Apart from +-*/, the three additional two-number functions accessible on the keyboard are:

Y x

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