HP 20b Business Consultant Financial Calculator User Manual download pdf (Page 30)

Mathematical Calculations22

1. Enter the two degrees of freedom by typing each number followed by I or

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. See

Table 2-6. Note: the examples below are calculated with Chain set as the operating

mode.

Table 2-6 Probability Example

Keys Display Description

10I

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

Chi

I or =

Validates the result.

Table 2-7 Inverse Probability Example

Keys Display Description

10I

0.37

12I

Enters 10 degrees of freedom and the

probability. Opens the Math menu.

<<I

<<<<

Selects the Probability menu item. Scrolls to

Chi

2-1

I or =

Validates the result.

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HP 20b Business Consultant Financial Calculator User Manual Page 30