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2-20 Math, Angle, and Test Operations
8302MATH.DOC TI-83 international English Bob Fedorisko Revised: 02/19/01 12:12 PM Printed: 02/19/01 2:27
PM Page 20 of 26
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MATH NUM CPX PRB
1: rand
Random-number generator
2: nPr
Number of permutations
3: nCr
Number of combinations
4: !
Factorial
5: randInt(
Random-integer generator
6: randNorm(
Random # from Normal distribution
7: randBin(
Random # from Binomial distribution
rand (random number) generates and returns one or more
random numbers > 0 and < 1. To generate a list of random-
numbers, specify an integer > 1 for
numtrials
(number of
trials). The default for
numtrials
is 1.
rand[(
numtrials
)]
Tip:
To generate random numbers beyond the range of 0 to 1, you
can include
rand
in an expression. For example,
rand
ä
5
generates a
random number > 0 and < 5.
With each rand execution, the TI
-
83 generates the same
random-number sequence for a given seed value. The TI
-
83
factory-set seed value for
rand is 0. To generate a different
random-number sequence, store any nonzero seed value to
rand. To restore the factory-set seed value, store 0 to rand
or reset the defaults (Chapter 18).
Note:
The seed value also affects
randInt(
,
randNorm(
, and
randBin(
instructions (page 2
.
22).
MATH PRB (Probability) Operations
MATH PRB Menu
rand