- Statistical reminder (4 exercices)
- Intersection and union (3 exercices)
- Relationship on union (5 exercices)
- Spreadsheet (2 exercices)
27o63o72o
ABE
E.7067
We’re
interested
in
three
classes
of
sixth
graders
at
a
school.
Volleyball
and
soccer
are
offered
as
extracurricular
activities,
and
between
them
they
have
354
members.
Here
is
some
additional
information
gathered
:
76
girls
have
signed
up
for
Volleyball
Volleyball
has
132
members.
The
boys
number
238
.
Volley-ball
Football
Total
Garçons
Filles
Total
E.7068
A
company
closes
in
July
and
August.
All
the
company’s
50
employees
take
their
vacations
during
this
period.
We
have
the
following
information
:
12
men
took
their
vacation
in
July.
28
people
took
their
vacation
in
August.
The
company
has
17
women
Copy
and
complete
the
table
opposite
:
July
August
Total
Femmes
en
vacances
Hommes
en
vacances
Total
en
vacances
E.7075
The
semi-circular
diagram
below
shows
the
grades
of
the
384
students
in
all
fourth-year
classes
at
a
school:
Complete
the
table
below
;
the
numbers
will
be
rounded
to
the
nearest
whole
number
and
the
frequencies
in
percentage
will
be
rounded
to
the
nearest
tenth.
Class
[0
;
5[
[5
;
10[
[10
;
15[
[15
;
20[
total
Angles
Number
Cum.
no.
ascending
Cum.
freq.
descending
Frequency
en
%
(To
fill
in
the
line
for
ˇ
numbers
of
students
ı,
use
the
propor-tionality
between
the
size
of
the
angles
and
this)
2.
Intersection
and
union
E.7076
Consider
a
population
E
and
two
sub-populations
A
and
B
shown
below.
1
a
What
is
the
total
number
of
people
in
this
study?
b
Give
the
size
of
the
subpopulation
A
.
Give
the
per-centage
proportion
represented
by
A
relative
to
E
.
c
Determine
the
proportion
of
B
individuals
among
E
.
2
a
Determine
the
size
of
the
union
A
∪
B
of
the
subpop-ulations
A
and
B
.
b
Deduce
the
proportion
near
A
∪
B
among
E
.
3
a
Determine
the
size
of
the
intersection
A
∩
B
of
the
subpopulations
A
and
B
.
b
Deduce
the
approximate
percentage
proportion
of
A
∩
B
among
E
;
https://chingmath.fr
chapExoCorrec/7067
sacados/7067
chapExoCorrec/7068
sacados/7068
chapExoCorrec/7075
sacados/7075
27o63o72o
chapExoCorrec/7076
sacados/7076
ABE
EAB
ABE
E.7078
Consider
a
population
E
and
two
sub-populations
A
and
B
shown
below.
Results
should
be
rounded
to
the
nearest
tenth.
1
What
percentage
proportion
is
represented
by
A
∪
B
among
E
?
2
a
What
percentage
proportion
is
represented
by
A
∩
B
among
E
?
b
What
percentage
proportion
is
represented
by
A
∩
B
among
A
?
E.7148
In
a
high
school,
the
grouping
of
Terminale
STG
students
according
to
their
specialization
and
choice
of
modern
language
1
is
shown
in
the
table
below
:
English
Italian
Spanish
Total
CGRH
15
12
9
36
Marketing
21
15
18
54
CFE
15
21
9
45
GSI
6
6
3
15
Total
57
54
39
150
We
consider
the
following
sub-populations
:
C
:
ˇ
all
students
who
have
chosen
the
CGRH
specializa-tion
ı
;
I
:
ˇ
all
students
studying
Italian
as
their
first
foreign
language
ı
1
Determine
the
proportions
represented
by
each
of
the
sub-populations
C
and
I
among
all
Terminale
STG
stu-dents.
2
We
denote
A
as
the
subpopulation
of
students
who
have
chosen
the
specialty
CGRH
and
are
studying
Italian
as
their
first
foreign
language.
Determine
the
proportion
of
subpopulation
A
among
all
STG
students.
3
Consider
the
subpopulation
B
of
students
who
have
cho-sen
the
specialty
CGRH
or
are
studying
Italian
as
their
first
foreign
language.
Determine
the
proportion
of
the
subpopulation
B
among
all
STG
students.
3.
Relationship
on
union
E.7091
Consider
a
population
E
and
two
sub-populations
A
and
B
represented
below
:
The
crosses
represent
the
individuals
in
the
study
population.
We
note
n
E
,
n
A
,
n
B
,
n
A
∪
B
,
n
A
∩
B
the
respective
headcounts
of
E
,
A
,
B
,
A
∪
B
and
A
∩
B
.
1
a
Determine
headcount
values
n
E
,
n
A
,
n
B
,
n
A
∪
B
,
n
A
∩
B
.
b
What
relationship
checks
n
A
,
n
B
,
n
A
∪
B
and
n
A
∩
B
?
2
Establish
equality:
p
A
∪
B
=
p
A
+
p
B
−
p
A
∩
B
E.7092
In
a
population
E
,
consider
the
two
sub-populations
A
and
B
verifying
whose
proportions
relative
to
E
verify:
p
A
=
0.37
;
p
B
=
0.48
;
p
A
∪
B
=
0.62
1
Determine
the
value
of
p
A
∩
B
.
2
Results
should
be
rounded
to
the
nearest
unit.
a
Knowing
that
the
subpopulation
B
has
a
population
size
of
212
,
determine
the
total
population
size.
b
Deduce
the
size
of
the
intersection
A
∩
B
.
https://chingmath.fr
chapExoCorrec/7078
sacados/7078
EAB
chapExoCorrec/7148
sacados/7148
chapExoCorrec/7091
sacados/7091
ABE
chapExoCorrec/7092
sacados/7092
1234567ABCDEFNordSudEstOuestTOTALFootball15012575250600Handball50753085240Tennis35301550130Judo705020100240TOTAL3052801404851210Fréquenceen%25,223,111,640,1100
E.7094
A
school
offers
only
two
extracurricular
activities:
a
drama
club
and
an
introductory
programming
workshop.
We
know
that
the
same
number
of
people
are
enrolled
in
both
activities.
We
adopt
the
following
notations
:
T
:
the
subpopulation
of
students
enrolled
in
the
drama
club
;
I
:
the
subpopulation
of
students
enrolled
in
the
com-puter
workshop.
The
following
proportions
are
given
:
p
T
∩
I
=
0.13
;
p
T
∪
I
=
0.47
Determine
the
proportion
of
subpopulations
T
and
IP
rela-tive
to
the
school
as
a
whole.
E.7149
We
consider
the
table
below,
which
gives
the
baccalaureate
results
of
175
students
in
the
final
classes
of
a
lycée
according
to
the
series
:
Terminale
S
Terminale
ES
Terminale
STG
Total
Admis
63
28
63
154
Refusés
7
6
8
21
Total
70
34
71
175
We
note
:
A
:
ˇ
the
subpopulation
of
students
admis
ı
;
S
ˇ
the
subpopulation
of
Terminale
S
students
ı.
1
Determine
the
proportions
p
A
,
p
S
and
p
A
∪
S
respectively
of
the
A
,
S
and
A
∪
S
subpopulations
among
all
Termi-nale
students.
2
Indicate
the
proportion
of
the
subpopulation
A
∩
S
.
E.7093
An
urn
contains
twenty
balls
numbered
from
1
to
20;
the
first
five
are
red,
the
next
seven
are
blue,
the
next
eight
are
yellow.
The
study
population
is
the
set
of
balls
in
the
urn,
and
we
consider
the
following
subpopulations
A
:
ˇ
Balls
with
a
number
pair
ı
;
B
:
ˇ
Balls
rouges
ı
;
C
:
ˇ
Red
or
numbered
balls
pair
ı
;
D
:
ˇ
Red
balls
and
bearing
an
even
number
ı.
1
Determine
the
numbers
in
each
of
these
subpopulations.
2
What
relationships
can
be
established
between
these
numbers?
4.
Spreadsheet
E.7073
A
study
looks
at
the
number
of
sports
licensees
in
a
department.
To
facilitate
this
study,
the
depart-ment
was
divided
into
four
parts
(North,
South,
East,
West)
.
Here
is
a
table
summarizing
this
study
:
The
data
from
the
range
B2:E5
was
entered,
then
three
for-mulas
were
used
:
A
formula
in
F2
,
then
copied
to
the
range
F2:F5
;
A
formula
in
B6
,
then
copied
to
the
range
B6:F6
;
A
formula
in
B7
,
then
copied
to
the
range
B7:F7
;
1
Among
the
proposed
formulas,
which
formula
is
used
in
F2
?
a
=
SUM(B2:E2)
b
=SUM(B$2:E$2)
2
Which
of
the
formulas
provided
is
used
in
B6
?
a
=SUM(B2:B5)
b
=
SUM($B2:$B5)
3
Among
the
formulas
provided,
which
formula
is
used
in
B7
?
a
=ROUND(B6/F6;2)
b
=ROUND(B6/F$6;2)
c
=ROUND(B6/$F6;2)
d
=ROUND(B$6/F6;2)
https://chingmath.fr
chapExoCorrec/7094
sacados/7094
chapExoCorrec/7149
sacados/7149
chapExoCorrec/7093
sacados/7093
chapExoCorrec/7073
sacados/7073
1234567ABCDEFNordSudEstOuestTOTALFootball15012575250600Handball50753085240Tennis35301550130Judo705020100240TOTAL3052801404851210Fréquenceen%25,223,111,640,1100
12345678910111213ABCDtableau1chaînebleuechaînejauneTotalnombred’incidentspourlesquelsl’alarmeafonctionné4672nombred’incidentspourlesquelsl’alarmen’apasfonctionnéTotal52tableau2pourcentaged’incidentspourlesquelsl’alarmeafonctionné96%pourcentaged’incidentspourlesquelsl’alarmen’apasfonctionnéTotal100%100%tableau3chaînebleuechaînejauneTotalpourcentaged’incidentspourlesquelsl’alarmeafonctionné39%61%100%pourcentaged’incidentspourlesquelsl’alarmen’apasfonctionné67%33%100%
Tauxdedéfaillancedusystèmed’alarmeen%0123456789101112Coûtmoyend’uneinterventioneneuros5001000150020002500
E.7071
A
company
has
two
production
lines
designated
as
:
blue
line,
yellow
line.
An
alarm
system
detects
incidents
that
may
occur
on
each
of
these
two
lines.
In
order
to
check
the
effectiveness
of
this
alarm
system,
the
number
of
times
the
system
was
triggered
over
a
one-month
period
was
observed,
as
well
as
any
fail-ures
(i.e.
incidents
that
occurred
without
the
alarm
being
trig-gered)
.
The
results
were
recorded
in
a
spreadsheet
(Table
1)
.
Some
cells
in
this
table
have
been
hidden.
There
were
52
incidents
on
the
blue
line,
46
of
which
were
detected
by
the
alarm
system.
For
the
yellow
chain,
the
alarm
system
was
triggered
72
times,
or
in
96
%
of
the
incidents
that
occurred
on
this
chain.
1
a
Calculate
the
total
number
of
incidents
that
oc-curred
on
the
yellow
chain.
b
Complete
Table
1.
c
What
formula
was
entered
in
cell
D2
,
given
that
it
was
copied
down
to
D4
?
2
In
Table
2,
where
the
cells
are
formatted
as
percentages,
we
want
to
obtain
the
percentages
relative
to
the
number
of
incidents
observed
on
each
chain
a
Calculate
the
percentage
of
incidents
that
occurred
on
the
blue
chain
for
which
the
alarm
did
not
work.
The
result
will
be
rounded
to
0.1
%
.
b
Complete
Table
2.
c
Which
formula
was
entered
in
cell
B7
,
and
then
copied
down
into
cells
B8
et
B9
?
3
We
are
interested
in
Table
3.
a
In
cell
C13
,
we
find
the
number
33
%
.
Give
an
inter-pretation
of
this
number.
b
What
formula
was
entered
in
cell
B12
,
and
then
copied
throughout
Table
3?
4
The
failure
rate
of
an
alarm
system
is
defined
as
the
per-centage
of
incidents
for
which
the
alarm
did
not
work
compared
to
the
total
number
of
incidents
that
occurred
on
the
chain,
based
on
the
failure
rate
of
the
alarm
sys-tem.
The
company
considers
that
the
alarm
system
is
not
ef-fective
when
the
average
cost
of
an
intervention
exceeds
1
500
e
.
a
At
what
failure
rate
is
the
alarm
system
no
longer
con-sidered
effective?
The
result
will
be
given
to
the
near-est
0.2
%
b
Is
the
alarm
system
effective
for
the
blue
chain?
For
the
yellow
chain?
Justify
https://chingmath.fr
chapExoCorrec/7071
sacados/7071
12345678910111213ABCDtableau1chaînebleuechaînejauneTotalnombred’incidentspourlesquelsl’alarmeafonctionné4672nombred’incidentspourlesquelsl’alarmen’apasfonctionnéTotal52tableau2pourcentaged’incidentspourlesquelsl’alarmeafonctionné96%pourcentaged’incidentspourlesquelsl’alarmen’apasfonctionnéTotal100%100%tableau3chaînebleuechaînejauneTotalpourcentaged’incidentspourlesquelsl’alarmeafonctionné39%61%100%pourcentaged’incidentspourlesquelsl’alarmen’apasfonctionné67%33%100%
Tauxdedéfaillancedusystèmed’alarmeen%0123456789101112Coûtmoyend’uneinterventioneneuros5001000150020002500