Grade 11 - STMG / Proportion 14 exercises (100% corrected)

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CyclomotoristesUsagersdevoituresdetourismeMotocyclistesNombredepersonne5001000150020002500300012ans13ans14ans15ans16ans17ans18ans19ans20ans21ans22ans23ans24ans 1. Statistical reminder E.7070 The two parts are independent Part A In 2003, on average, every day in France, nearly 49.1 people âaged 12 to 18 were victims (injured or killed) in road acci-dents. On average, mopeds account for the highest number of victims (26.0 victims per day) , followed by passenger cars (12.8 victims per day) , pedestrians (5.0 victims per day) and cyclists (2.5 victims per day) . The table below shows the distribution of road accident vic-tims âaged 12 to 18 by age and user category for the year 2003. Age Pedestrians Cyclis te Cyclo moto ristes Moto cycliste Usagers de voiture de tourisme Autres Users* Total 12 ans 330 147 49 22 247 24 819 13 ans 263 165 122 23 279 26 878 14 ans 234 135 1 010 35 292 37 1 743 15 ans 260 139 1 701 57 396 27 2 580 16 ans 269 111 2 549 136 610 25 3 700 17 ans 223 111 2 457 259 925 39 4 013 18 ans 248 115 1 605 214 1 940 59 4 181 Total 1 827 923 9 493 745 4 689 237 17 914 * Users of vans, heavy goods vehicles, public transport. . . Data from the website : http://eduscol.education.fr/D0187/default.htm 1 Check that in 2003, on average, there were 26.0 moped riders âaged 12 to 18 who were victims of road accidents every day in France. 2 Calculate the percentage, among moped riders, of acci-dent victims under 13 years of age, rounded to the nearest 0.1 % 3 Calculate the percentage of accident victims under 18 years of age among all accident victims, rounded to the nearest 0.1 % . Part B The graph below gives, for the âge 12-24 age group, the num-ber of road accident victims in 2003 by âge for three user categories: moped riders, motorcyclists and passenger car users. Victims of accidents on mopeds, motorcycles or passenger cars 1 a Indicate the âges for which, in 2003 the number of passenger car casualties exceeds 2 000. the number of moped casualties is approximately equal to 1 000. b Avec the precision allowed by the graph, determine the number of moped riders âaged 20 years who are victims of a road accident. 2 a At what âage is the number of victims of passenger car accidents at its highest? b What phenomenon(s)(s) can explain the fact that as age increases, the number of victims of passenger car accidents rises rapidly and then gradually declines? https://chingmath.fr chapExoCorrec/7070 sacados/7070 Extrait France 1L Septembre 2006 CyclomotoristesUsagersdevoituresdetourismeMotocyclistesNombredepersonne5001000150020002500300012ans13ans14ans15ans16ans17ans18ans19ans20ans21ans22ans23ans24ans
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