HP 48gII Manual de usuario descargar pdf (Pagina 155)

Page 15-1

Chapter 15

Probability Distributions

In this Chapter we provide examples of applications of the pre-defined

probability distributions in the calculator.

The MTH/PROBABILITY.. sub-menu - part 1

The MTH/PROBABILITY.. sub-menu is accessible through the keystroke

sequence

„´

. With system flag 117 set to CHOOSE boxes, the

following functions are available in the PROBABILITY.. menu:

In this section we discuss functions COMB, PERM, ! (factorial), and RAND.

Factorials, combinations, and permutations

The factorial of an integer n is defined as: n! = n⋅ (n-1) ⋅ (n-2)…3⋅2⋅1. By

definition, 0! = 1.

Factorials are used in the calculation of the number of permutations and

combinations of objects. For example, the number of permutations of r

objects from a set of n distinct objects is

)/(!)1)...(1)(1( rnnrnnnn

P −=+−−−=

Also, the number of combinations of n objects taken r at a time is

)!(!

)1)...(2)(1(

rnr

rnnnn

−

+−−−

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HP 48gII Manual de usuario Pagina 155