Casio fx-3650P - The Binomial Distribution

36
26 The binomial distribution
Assume that the probability that a tossed coin will land showing “heads” is , and that the
probability for “tails” is ( ). Then over tosses, the probability that the coin will land
times with “heads”-up, is:
Program
？→ Ａ：？→ Ｂ：？→ Ｘ：ＢCＸ × Ａ ＾ Ｘ（１－ Ａ）＾（Ｂ － Ｘ）→ Ｙ：Ｙ ＜ 34 STEP ＞
C：
INPUT Ａ: throws Ｂ: probability of “heads” Ｘ: number of “heads”
Execution Example:
For a coin with probability of landing “heads”,
find the probability of getting 3 “heads” out of 7 throws.
p
1 p– x
f
x() C
m
p
x
x
1p–()
mx–
=
nCr
1
3
---
Prog
1
S A
D R P1
P1
P2 P3 P4 G
1 3
EXE
S A
D R P1
P1
P2 P3 P4 G
7
EXE
S A
D R P1
P1
P2 P3 P4 G
3
EXE
S A
D R P1
P1
P2 P3 P4 G
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