HP 20B User Manual

Mathematical Calculations
26
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 2-6 Probability 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 Chi
2
.
I or =
Validates the result.
Table 2-7 Inverse 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 Chi
2-1
.
I or =
Validates the result.
Two-Number Functions
Apart from +-*/, the three additional two-number functions accessible on the keyboard are:
 Y
x

HP 20B Specifications

General

Type	Financial
Cover	-
Form factor	Pocket
Control type	Buttons
Product color	Black
Digits	12 digits
Display type	LCD
Display tilting	No
Display number of lines	2 lines
Battery type	CR2032
Power source	Battery
Auto power off	Yes
Number of batteries supported	2
Memory registers	110

Weight and Dimensions

Depth	149.2 mm
Width	77 mm
Height	16 mm
Weight	37.5 g