, Probability
PCE) probability of :
on event
If P(C) 1 It
certainty
=
is a
;
unblased-outcome is equal chance on each side
= at draw
indep event possibility is and
=
.
dep .
event= possible outcomes I at and draw
n(E) : outcome you want
PCE) =
n ( s ) total outcomes
O I
Scale :
L
impossible
certainty
Representing Probability
1 .
Fraction : 31
.
2 decimal :
0 S .
percentage
:
.
3 50 %
Probability Space
Roll a dice a flip a coin
H T
I It IT
2 2H 2T Total poss .
Outcomes : 12
3 3H 35
44H & T
S SH ST
6 GH OT
Tree Diagram
Indep Events :
R
.
3/12 R For
* 2 events (heads+ red ball ; multiply probabilities
a
1
412 g
R
·
2
3 -
·
& 4/12 O
G :
a
3
"12 R
6
B :
G
Dep Events .
:
R 2/i=
sum
3/12 R
0 = 4/11 =
PCBB GG or OO or RR)
i
= P(BB) + P(GG) + P(od) + P(RR)
R3/11
412 g 0 = 3/1 -
(ii) ( (i) () + + +
G - 2 or 23 % or 0 23
R
.
-
4/12 T
G
:
"12 R =
3/1
B
:
PCE) probability of :
on event
If P(C) 1 It
certainty
=
is a
;
unblased-outcome is equal chance on each side
= at draw
indep event possibility is and
=
.
dep .
event= possible outcomes I at and draw
n(E) : outcome you want
PCE) =
n ( s ) total outcomes
O I
Scale :
L
impossible
certainty
Representing Probability
1 .
Fraction : 31
.
2 decimal :
0 S .
percentage
:
.
3 50 %
Probability Space
Roll a dice a flip a coin
H T
I It IT
2 2H 2T Total poss .
Outcomes : 12
3 3H 35
44H & T
S SH ST
6 GH OT
Tree Diagram
Indep Events :
R
.
3/12 R For
* 2 events (heads+ red ball ; multiply probabilities
a
1
412 g
R
·
2
3 -
·
& 4/12 O
G :
a
3
"12 R
6
B :
G
Dep Events .
:
R 2/i=
sum
3/12 R
0 = 4/11 =
PCBB GG or OO or RR)
i
= P(BB) + P(GG) + P(od) + P(RR)
R3/11
412 g 0 = 3/1 -
(ii) ( (i) () + + +
G - 2 or 23 % or 0 23
R
.
-
4/12 T
G
:
"12 R =
3/1
B
:
