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3
2
1
Grade 11 - STMG
/ conditional probability
18 exercises (including 16 corrected)
a
Probability tree construction
(6 exercices)
Conditional Probability: Introduction
(2 exercices)
Conditional probability
(1 exercice)
Independent events
(8 exercices)
A
B
B
B
A
B
B
A
A
B
1.
Pr
ob
ability
tr
e
e
c
onstruction
E.11536
Consider
a
set
Ω
and
t
w
o
of
its
parts
A
and
B
sho
wn
b
elo
w,
whose
elemen
ts
are
represen
ted
b
y
crosses
:
Equally
lik
ely
,
w
e
c
ho
ose
an
elemen
t
at
random.
1
Determine
the
probabilit
y
of
ev
en
t
A
and
ev
en
t
A
.
2
Assuming
that
the
c
hosen
elemen
t
do
es
not
b
elong
to
A
:
a
what
is
the
probabilit
y
that
this
ev
en
t
b
elongs
to
B
?
b
what
is
the
probabilit
y
that
this
ev
en
t
do
es
not
b
elong
to
B
?
3
Assuming
that
the
c
hosen
elemen
t
b
elongs
to
A
:
a
what
is
the
probabilit
y
that
this
ev
en
t
b
elongs
to
B
?
b
what
is
the
probabilit
y
that
this
ev
en
t
do
es
not
b
elong
to
B
?
4
Complete
the
probabilit
y
tree
b
elo
w
:
E.11537
Consider
the
univ
erse
Ω
and
its
t
w
o
ev
en
ts
A
and
B
are
rep-
resen
ted
:
An
elemen
t
of
the
univ
erse
Ω
is
c
hosen
at
random.
1
Determine
the
probabilit
y
of
ev
en
t
A
and
ev
en
t
A
.
2
Assuming
that
the
c
hosen
elemen
t
do
es
not
b
elong
to
A
:
a
what
is
the
probabilit
y
that
this
ev
en
t
b
elongs
to
B
?
b
what
is
the
probabilit
y
that
this
ev
en
t
do
es
not
b
elong
to
B
?
3
Assuming
that
the
c
hosen
elemen
t
b
elongs
to
A
:
a
what
is
the
probabilit
y
that
this
ev
en
t
b
elongs
to
B
?
b
what
is
the
probabilit
y
that
this
ev
en
t
do
es
not
b
elong
to
B
?
4
Complete
the
probabilit
y
tree
b
elo
w
:
h
ttps:/
/c
hingmath.fr
chapExoCorrec/11536
sacados/11536
A
B
B
B
A
B
B
A
chapExoCorrec/11537
sacados/11537
A
B
B
B
A
B
B
A
C
T
R
R
C
T
R
R
M
M
E
M
M
E
E.11538
A
game
consists
of
shaking
and
turning
a
b
ottle
upside
do
wn
to
remo
v
e
one
of
its
con
ten
ts.
Here
is
the
con
ten
t
of
this
b
ottle
:
W
e
assume
that
the
la
w
of
equiprobabilit
y
applies
to
this
ran-
dom
exp
erimen
t.
W
e
consider
the
4
ev
en
ts
b
elo
w
:
R
:
ˇ
The
item
that
comes
out
is
a
strip
e
ı
;
C
:
ˇ
The
item
that
comes
out
is
a
square
ı
;
T
:
ˇ
The
item
dra
wn
is
a
triangle
ı
;
R
:
ˇ
The
item
dra
wn
is
a
circle
ı
;
Construct
the
probabilit
y
tree
:
E.11539
A
to
y
compan
y
sp
ecializes
in
man
ufacturing
dolls
that
talk
and
w
alk.
Eac
h
doll
can
ha
v
e
t
w
o
defects
and
only
t
w
o
:
one
mec
hanical
defect
and
one
electrical
defect.
A
statistical
study
sho
ws
that
:
8%
of
the
dolls
ha
v
e
the
mec
hanical
defect
;
5%
of
the
dolls
ha
v
e
the
electrical
defect
;
2%
of
the
dolls
ha
v
e
b
oth
defects.
Daily
pro
duction
is
1,000
dolls.
1
Cop
y
and
complete
the
table
b
elo
w,
whic
h
describ
es
daily
pro
duction
:
dolls
with
mec
hanical
defect
Dolls
without
mec
hanical
defect
total
Dolls
with
electrical
defect
Dolls
without
electrical
defects
T
otal
80
1
000
In
the
r
est
of
the
exer
cise,
e
ach
numeric
al
r
esult
wil
l
b
e
given
in
de
cimal
form.
2
A
doll
is
randomly
selected
from
the
da
y’s
pro
duction.
Consider
the
t
w
o
ev
en
ts
b
elo
w
:
E
:
"
the
doll
selected
has
an
electrical
defect
"
M
:
"
The
sampled
doll
has
a
mec
hanical
defect
"
3
a
Determine
the
probabilit
y
of
ev
en
t
E
and
ev
en
t
E
b
Assuming
that
the
doll
selected
has
an
electrical
defect,
what
is
the
probabilit
y
that
this
doll
has
a
mec
hanical
problem?
c
Assuming
that
the
doll
selected
do
es
not
ha
v
e
an
elec-
trical
defect,
what
is
the
probabilit
y
that
this
doll
has
a
mec
hanical
problem?
4
Complete
the
probabilit
y
tree
b
elo
w
:
h
ttps:/
/c
hingmath.fr
chapExoCorrec/11538
sacados/11538
C
T
R
R
C
T
R
R
chapExoCorrec/11539
sacados/11539
M
M
E
M
M
E
Demi-pensionnaire
Garçon
A
B
E.11540
In
a
high
sc
ho
ol
with
2000
studen
ts,
the
distribution
of
stu-
den
ts
b
y
gender
and
c
hoice
of
first
foreign
language
is
giv
en
as
follo
ws
1
A
studen
t
claims
"
that
there
are
as
man
y
girls
as
b
o
ys
in
this
high
sc
ho
ol"
.
Is
he
righ
t?
Justify
y
our
answ
er.
A
studen
t
is
c
hosen
at
random,
with
equal
probabilit
y
,
from
this
high
sc
ho
ol.
Consider
the
follo
wing
ev
en
ts
:
Girls
Bo
ys
English
712
728
Other
L
V1
288
272
F
:
"the
studen
t
is
a
girl"
;
A
:
"the
studen
t
has
c
hosen
English
as
their
first
foreign
language"
In
the
follo
wing
questions,
the
results
will
b
e
giv
en
as
frac-
tions
that
do
not
need
to
b
e
simplified.
2
Determine
the
probabilit
y
of
ev
en
t
A
∩
F
.
3
Determine
the
probabilit
y
of
ev
en
t
A
giv
en
that
ev
en
t
F
has
o
ccurred.
4
Are
ev
en
ts
A
and
F
indep
enden
t?
Justify
y
our
answ
er.
5
W
e
kno
w
that
the
c
hosen
studen
t
is
a
b
o
y
.
Consider
the
follo
wing
statemen
t
:
"
The
probabilit
y
that
he
c
hose
English
as
his
first
foreign
language
is
more
than
three
times
greater
than
the
prob-
abilit
y
that
he
did
not
c
ho
ose
English
as
his
first
foreign
language.
".
Is
this
statemen
t
true?
Justify
y
our
answ
er.
E.11541
W
e
ha
v
e
a
biased
coin
for
whic
h
the
probabilit
y
of
getting
heads
when
tossed
is
equal
to
1
4
.
1
Determine
the
probabilit
y
of
getting
tails.
2
W
e
flip
this
coin
three
times
in
a
ro
w,
with
eac
h
flip
b
e-
ing
indep
enden
t,
and
note
the
result
(he
ads
or
tails)
for
eac
h
flip.
a
Represen
t
the
situation
using
a
probabilit
y
tree.
b
What
is
the
probabilit
y
of
getting
heads
exactly
once
in
these
three
tosses?
c
What
is
the
probabilit
y
of
nev
er
getting
heads?
2.
Conditional
Pr
ob
ability
:
Intr
o
duction
E.11511
In
a
statistical
study
,
w
e
con-
sider
a
class
of
24
studen
ts,
where
eac
h
studen
t
is
repre-
sen
ted
b
y
a
b
o
x
in
the
graph
b
e-
lo
w
:
G
:
ˇ
the
studen
t
is
a
b
o
y
ı
;
D
:
ˇ
the
studen
t
is
a
da
y
b
oarder
ı.
The
random
exp
erimen
t
con-
sists
of
c
ho
osing
a
studen
t
at
random
from
the
class
and
see-
ing
whether
or
not
these
t
w
o
cri-
teria
are
met
:
1
a
Determine
the
probabilit
y
of
c
ho
osing
a
"
b
o
y
".
b
Kno
wing
that
a
"
b
o
y
"
has
b
een
c
hosen,
what
is
the
probabilit
y
of
c
ho
osing
a
"
da
y
studen
t
"
c
Determine
the
probabilit
y
of
c
ho
osing
a
"
b
o
y
"
who
is
a
"
da
y
studen
t
".
d
What
do
w
e
notice?
2
a
Determine
the
probabilit
y
of
c
ho
osing
a
"
girl
".
b
Giv
en
that
a
"
girl
"
has
b
een
c
hosen,
what
is
the
prob-
abilit
y
of
c
ho
osing
a
"
da
y
studen
t
"
c
Determine
the
probabilit
y
of
c
ho
osing
a
"
girl
"
who
is
"
a
da
y
studen
t
".
d
What
do
w
e
notice?
E.11513
Consider
the
univ
erse
Ω
and
its
t
w
o
ev
en
ts
A
and
B
are
rep-
resen
ted
:
Use
the
la
w
of
equiprobabilit
y
.
1
a
Determine
the
probabilit
y
of
ev
en
t
A
.
b
Kno
wing
that
ev
en
t
A
has
o
ccurred,
determine
the
probabilit
y
of
ev
en
t
B
.
c
Determine
the
probabilit
y
of
ev
en
t
A
∩
B
.
d
What
do
w
e
notice?
2
a
Determine
the
probabilit
y
of
ev
en
t
A
.
b
Kno
wing
that
ev
en
t
A
has
o
ccurred,
determine
the
probabilit
y
of
ev
en
t
B
.
c
Determine
the
probabilit
y
of
ev
en
t
A
∩
B
.
d
What
do
w
e
notice?
3.
Conditional
pr
ob
ability
E.11512
In
a
statistical
study
,
w
e
consider
a
class
of
24
studen
ts,
where
eac
h
studen
t
is
represen
ted
b
y
a
b
o
x
in
the
graph
b
elo
w
:
h
ttps:/
/c
hingmath.fr
chapExoCorrec/11540
sacados/11540
chapExoCorrec/11541
sacados/11541
chapExoCorrec/11511
sacados/11511
Demi-pensionnaire
Garçon
sacados/11513
A
B
chapExoCorrec/11512
sacados/11512
Classe
B
Demi-pensionnaire
Garçon
:
:
:
:
:
:
G
:
:
:
G
D
:
:
:
:
:
:
G
:
:
:
G
D
A
B
C
D
0
1
1
2
1
0
1
1
0
2
0
1
1
1
1
2
B
B
A
B
B
A
0
;
2
0
;
41
B
0
;
59
B
A
0
;
8
0
;
41
B
0
;
59
B
A
T
w
o
c
haracteristics
are
studied
in
the
individuals
in
this
study
:
G
:
ˇ
the
studen
t
is
a
b
o
y
ı
;
D
:
ˇ
the
studen
t
is
a
da
y
studen
t
ı.
The
random
exp
erimen
t
consists
of
c
ho
osing
a
studen
t
at
ran-
dom
from
the
class
and
seeing
whether
or
not
these
t
w
o
cri-
teria
are
met.
1
a
Determine
the
probabilit
y
of
c
ho
osing
a
"
b
o
y
".
b
Kno
wing
that
a
"
b
o
y
"
has
b
een
c
hosen,
what
is
the
probabilit
y
of
c
ho
osing
a
"
da
y
studen
t
"
c
Determine
the
probabilit
y
of
c
ho
osing
a
"
b
o
y
"
who
is
"
an
external
studen
t
".
d
What
do
w
e
notice?
2
a
Determine
the
probabilit
y
of
c
ho
osing
a
"
girl
".
b
Giv
en
that
a
"
girl
"
has
b
een
c
hosen,
what
is
the
prob-
abilit
y
of
c
ho
osing
an
"
external
studen
t
"
c
Determine
the
probabilit
y
of
c
ho
osing
a
"
girl
"
who
is
"
external
".
d
What
do
w
e
notice?
4.
Indep
endent
events
E.11591
Consider
the
random
exp
erimen
t
of
univ
erse
Ω
represen
ted
b
elo
w
and
pro
vided
with
the
la
w
of
equiprobabilit
y
:
1
Consider
the
t
w
o
ev
en
ts
A
and
B
sho
wn
b
elo
w
:
Determine
the
follo
wing
probabilities
:
a
P
A
B
b
P
B
2
Consider
the
t
w
o
ev
en
ts
C
and
D
sho
wn
b
elo
w
:
Determine
the
follo
wing
probabilities
:
a
P
C
D
b
P
D
Definition
:
let
A
and
B
b
e
t
w
o
ev
en
ts.
The
ev
en
ts
A
and
B
are
said
to
b
e
indep
enden
t
P
A
B
=
P
B
.
3
Are
(
A
;
B
)
and
(
C
;
D
)
pairs
of
indep
enden
t
ev
en
ts.
E.11592
Un
The
game
consists
of
spinning
the
wheel
opp
osite
once
and
not-
ing
the
color
of
the
square
ob-
tained,
then
spinning
the
wheel
a
second
time
and
noting
the
n
um-
b
er
obtained.
The
t
w
o
thro
ws
of
the
wheel
are
ob
viously
indep
enden
t
of
eac
h
other.
Consider
the
t
w
o
ev
en
ts
:
A
:
ˇ
the
b
o
x
obtained
is
grey
on
the
first
tirage
ı
;
B
:
ˇ
the
resulting
square
is
n
um
b
ered
0
on
the
second
tirage
ı.
1
a
Determine
the
probabilities
:
P
B
;
P
A
B
b
Are
the
ev
en
ts
A
and
B
indep
enden
t?
2
Complete
the
probabilit
y
tree
:
E.11593
In
a
random
exp
erimen
t,
consider
t
w
o
ev
en
ts
A
and
B
allo
wing
the
probabilit
y
tree
to
b
e
con-
structed
:
1
Determine
the
probabilit
y
of
the
ev
en
t
B
.
2
Establish
that
the
ev
en
ts
A
and
B
are
indep
enden
t.
h
ttps:/
/c
hingmath.fr
Classe
B
Demi-pensionnaire
Garçon
:
:
:
:
:
:
G
:
:
:
G
D
:
:
:
:
:
:
G
:
:
:
G
D
chapExoCorrec/11591
sacados/11591
A
B
C
D
chapExoCorrec/11592
sacados/11592
0
1
1
2
1
0
1
1
0
2
0
1
1
1
1
2
B
B
A
B
B
A
chapExoCorrec/11593
sacados/11593
0
;
2
0
;
41
B
0
;
59
B
A
0
;
8
0
;
41
B
0
;
59
B
A
Nom
bre
de
bulb
es
de
tulip
e
jaune
Nom
bre
de
bulb
es
de
tulip
e
rouge
Nom
bre
de
bulb
es
de
tulip
e
noire
T
otal
Nom
bre
de
bulb
es
de
tulip
e
qui
πeuriron
t
Nom
bre
de
bulb
es
de
tulip
e
qui
ne
πeuriron
t
pas
T
otal
1
000
E.11594
In
a
class
of
30
studen
ts,
there
is
a
dra
wing
club
and
a
theater
club.
The
dra
wing
club
has
10
mem
b
ers,
and
the
theater
club
has
6
mem
b
ers.
T
w
o
studen
ts
are
mem
b
ers
of
b
oth
clubs.
A
studen
t
from
the
class
is
c
hosen
at
random
and
ask
ed
a
question.
W
e
call
:
D
the
ev
en
t
:
ˇ
The
student
is
a
memb
er
of
the
dr
awing
club
ı
;
T
the
ev
en
t
:
ˇ
The
studen
t
is
a
mem
b
er
of
the
theater
club
ı.
Sho
w
that
ev
en
ts
D
and
T
are
indep
enden
t.
E.11595
A
gardener
has
a
bag
filled
with
1.000
tulip
bulbs.
These
include
:
60
%
are
y
ello
w
tulip
bulbs
;
25
%
are
red
tulip
bulbs
;
the
rest
are
blac
k
tulip
bulbs.
In
addition
:
28
%
of
all
these
bulbs
will
not
flo
w
er
;
80
%
of
the
y
ello
w
tulip
bulbs
will
flo
w
er
;
60
blac
k
tulip
bulbs
will
not
flo
w
er.
P
art
A
Cop
y
and
complete
the
table
b
elo
w
:
P
art
B
The
gardener
dra
ws
a
bulb
at
random
from
his
bag.
W
e
note
:
F
the
ev
en
t
:
ˇ
The
bulb
wil
l
blo
om
ı
;
J
:
ˇ
The
bulb
is
that
of
a
tulip
jaune
ı
;
R
:
ˇ
The
bulb
is
that
of
a
tulip
r
ouge
ı
;
N
:
ˇ
The
bulb
is
that
of
a
tulip
noir
e
ı.
1
Determine
the
probabilities
of
the
follo
wing
ev
en
ts
:
J
∩
F
,
J
,
F
,
J
∪
F
.
2
Are
the
ev
en
ts
J
and
F
indep
enden
t?
Justify
the
answ
er.
E.11596
During
the
man
ufacture
of
a
pair
of
sp
ectacles,
the
pair
of
lenses
m
ust
undergo
t
w
o
treatmen
ts
noted
T
1
and
T
2
.
One
pair
of
glasses
is
tak
en
at
random
from
the
pro
duction.
W
e
denote
b
y
A
the
ev
en
t
:
ˇ
the
pair
of
lenses
has
a
defect
for
the
T
1
treatmen
t.
W
e
denote
b
y
B
the
ev
en
t
:
ˇ
the
pair
of
glasses
has
a
defect
for
treatmen
t
T
2
ı.
W
e
note
A
and
B
resp
ectiv
ely
the
opp
osite
ev
en
ts
of
A
and
B
.
One
study
sho
w
ed
that
:
the
probabilit
y
that
a
pair
of
lenses
has
a
defect
for
T
1
noted
P
A
is
equal
to
0.1
.
the
probabilit
y
that
a
pair
of
lenses
has
a
defect
for
T
2
noted
P
B
is
equal
to
0.2
.
the
probabilit
y
that
a
pair
of
lenses
has
neither
defect
is
0.75
.
1
Cop
y
and
complete
the
follo
wing
table
with
the
corre-
sp
onding
probabilities.
A
A
T
otal
B
B
T
otal
1
2
a
Determine,
justifying
the
answ
er,
the
probabilit
y
that
a
pair
of
lenses,
tak
en
at
random
from
pro
duction,
will
ha
v
e
a
defect
for
at
least
one
of
the
t
w
o
treatmen
ts
T
1
or
T
2
.
b
Giv
e
the
probabilit
y
that
a
pair
of
lenses,
tak
en
at
ran-
dom
from
pro
duction,
has
t
w
o
defects,
one
for
eac
h
T
1
treatmen
t
and
T
2
.
c
Are
the
ev
en
ts
A
and
B
indep
enden
t?
Justify
the
an-
sw
er.
h
ttps:/
/c
hingmath.fr
chapExoCorrec/11594
sacados/11594
chapExoCorrec/11595
sacados/11595
Nom
bre
de
bulb
es
de
tulip
e
jaune
Nom
bre
de
bulb
es
de
tulip
e
rouge
Nom
bre
de
bulb
es
de
tulip
e
noire
T
otal
Nom
bre
de
bulb
es
de
tulip
e
qui
πeuriron
t
Nom
bre
de
bulb
es
de
tulip
e
qui
ne
πeuriron
t
pas
T
otal
1
000
chapExoCorrec/11596
sacados/11596
Demi-pensionnaire
Garçon
E.11485
In
a
statistical
study
,
w
e
con-
sider
a
class
of
24
studen
ts,
where
eac
h
studen
t
is
repre-
sen
ted
b
y
a
b
o
x
in
the
graph
b
e-
lo
w
:
G
:
ˇ
the
studen
t
is
a
b
o
y
ı
;
D
:
ˇ
the
studen
t
is
a
da
y
b
oarder
ı.
The
random
exp
erimen
t
con-
sists
of
c
ho
osing
a
studen
t
at
random
from
the
class
and
see-
ing
whether
or
not
these
t
w
o
cri-
teria
are
met
:
1
a
Determine
the
probabilit
y
of
c
ho
osing
a
"
b
o
y
".
b
Kno
wing
that
a
"
b
o
y
"
has
b
een
c
hosen,
what
is
the
probabilit
y
of
c
ho
osing
a
"
da
y
studen
t
"
c
Determine
the
probabilit
y
of
c
ho
osing
a
"
b
o
y
"
who
is
a
"
da
y
studen
t
".
d
What
do
w
e
notice?
2
a
Determine
the
probabilit
y
of
c
ho
osing
a
"
girl
".
b
Giv
en
that
a
"
girl
"
has
b
een
c
hosen,
what
is
the
prob-
abilit
y
of
c
ho
osing
a
"
da
y
studen
t
"
c
Determine
the
probabilit
y
of
c
ho
osing
a
"
girl
"
who
is
"
a
da
y
studen
t
".
d
What
do
w
e
notice?
E.11620
Une
en
treprise
ferme
aux
mois
de
juil-
let
et
août.
L’ensem
ble
des
180
emplo
y
és
d’une
en
treprise
prennen
t
leurs
congés
p
endan
t
cette
p
ério
de.
On
a
les
informations
suiv
an
tes
:
28
hommes
on
t
pris
leurs
v
acances
en
juillet.
138
p
ersonnes
on
t
pris
leurs
v
acances
en
août.
L’en
treprise
compte
60
femmes.
On
crée
une
exp
érience
aléatoire
en
c
hoisissan
t
au
hasard
un
emplo
y
é
de
cette
en
treprise.
On
considère
les
deux
év
énemen
ts
ci-dessous
:
F
:
"
l’emplo
y
é
c
hoisi
est
une
femme
"
;
J
:
"
l’emplo
y
é
c
hoisi
prend
ses
v
acances
en
juillet
".
1
Repro
duire
et
compléter
le
tableau
ci-con
tre
:
Juillet
A
oût
T
otal
F
emmes
en
v
acances
Hommes
en
v
acances
T
otal
en
v
acances
2
Donner
les
probabilités
:
P
(
F
)
;
P
(
F
∩
J
)
;
P
(
P
(
F
∩
J
)
3
a
Déterminer
la
probabilité
P
J
(
F
)
.
b
Est-ce
que
les
év
énemen
ts
F
et
J
son
t
indép
endan
ts
?
Justifier.
5.
Shar
es
E.11584
Un
village
prop
ose
aux
partici-
pan
ts
de
la
fête
du
sp
ort
deux
épreuv
es
:
une
randonnée
et
un
cross.
Il
n’est
pas
p
ossible
de
s’inscrire
aux
deux
épreuv
es
à
la
fois.
On
disp
ose
des
informations
suiv
an
tes
:
90%
des
participan
ts
on
t
c
hoisi
la
randonnée,
parmi
eux,
5%
son
t
licenciés
dans
un
club.
10%
des
participan
ts
on
t
c
hoisi
le
cross,
parmi
eux,
40%
son
t
licenciés
dans
un
club.
Un
journaliste
in
terroge
un
participan
t
au
hasard.
On
considère
les
év
énemen
ts
suiv
an
ts
:
R
:
"
Le
participan
t
a
c
hoisi
la
randonnée
"
L
:
"
Le
participan
t
est
licencié
dans
un
club
"
1
P
ar
simple
lecture
de
l’énoncé,
indiquer
:
a
La
probabilité
que
le
participan
t
in
terrogé
soit
licencié
dans
un
club
sac
han
t
qu’il
a
c
hoisi
la
randonnée.
b
La
probabilité
que
le
participan
t
in
terrogé
soit
licencié
dans
un
club
sac
han
t
qu’il
a
c
hoisi
le
cross.
En
prenan
t
connaissance
de
ces
deux
probabilités,
le
journaliste
estime
que
s’il
c
hoisit
un
participan
t
parmi
ceux
qui
son
t
licenciés
dans
un
club,
la
probabilité
qu’il
ait
effectué
le
cross
sera
largemen
t
sup
érieure
à
50%.
L’ob
jectif
des
questions
suiv
an
tes
est
de
v
érifier
si
cette
in
tuition
est
correcte.
2
Représen
ter
la
situation
par
un
arbre
de
probabilités.
3
a
Déterminer
la
probabilité
que
le
participan
t
in
ter-
rogé
ait
c
hoisi
le
cross
et
soit
licencié
dans
un
club.
b
Vérifier
que
la
probabilité
que
le
participan
t
in
terrogé
soit
licencié
dans
un
club
est
égale
à
850
10
000
;
soit
8
;
5%.
4
Le
journaliste
in
terroge
un
participan
t
licencié
dans
un
club.
Déterminer
la
probabilité
que
ce
participan
t
ait
c
hoisi
le
cross.
L’in
tuition
du
journaliste
est-elle
correcte
?
h
ttps:/
/c
hingmath.fr
chapExoCorrec/11485
sacados/11485
Demi-pensionnaire
Garçon
chapExoCorrec/11620
sacados/11620
sacados/11584
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