37
Chapter 2: Operating the Graphing Calculator
3 rndNorm( rndNorm(
mean, standard deviation [,number of trial]
)
Returns a random real number
from a specified normal distribution.
* Number of trial :
1
≤
n
≤
999 (
n
is an integer.)
Standard deviation : 0 <
s
4 rndBin( rndBin(
number of trial, probability of success [, number of
simulations]
)
Returns a random real number from
a specified binominal distribution.
* Number of trial : 1
≤
n
≤
9999
Probability of success : 0
≤
p
≤
1
Number of simulations :
1
≤
n
≤
999 (
n
is an integer.)
Note: The random functions will generate different numbers every time.
Therefore, the table values of the random functions will be different
every time. When in case of random-based graphing calculations,
the tracing values and other parameters of the graph will not match
the graph’s visual representation.
5 nPr Returns the total number of different arrangements (permutations)
for selecting “r” items out of “n” items.
n
P
r
=
n!
(n
–
r)!
Example
• How many different ways can 4
people out of 6 be seated in a
car with four seats?
6
M
C
5
4
E
6 nCr Returns the total number of combinations for selecting “r” item out
of “n” items. (Binomial distribution)
n
C
r
=
n!
r!(n
–
r)!
Example
• How many different groups of
7 students can be formed with
15 students?
1 5
M
C
6
7
E