Génération des données des exercice 2-1 et suivants

Needs["Tableaux`"]

distr = NormalDistribution[56,7]

x=RandomReal[distr,400]

Pour les données des exercices, on choisit un échantillon ainsi généré dont on arrondit les valeurs:

x=Round[{62.198721503212484`,52.1253261459507477`,63.4846422533891185`,65.0506842151203557`,56.2119624511905691`,54.956372410036165`,42.0738089726592257`,41.8242927695412003`,60.4645015431624699`,40.9912172994112378`,56.6942193854783393`,59.0267943500875258`,59.4362090238392593`,55.448222125428721`,45.0177661575322396`,44.1113570889218475`,59.1633368314944529`,39.8301293373704901`,56.1265002158292602`,60.6376677283023379`,62.7406942511635179`,58.5458210040260329`,48.1926911031847637`,47.1190792105790201`,69.0118192919547279`,73.0798616978754633`,55.3226313706457428`,56.0204507259038919`,43.1438255522847935`,70.6760099984203993`,57.0129955820049971`,54.9046067166666862`,53.7359314764695916`,54.9609065787860195`,46.9286136796158093`,42.7119152845151894`,41.9815675069165017`,46.6242349671060107`,80.2172183806423078`,59.5805173319417136`,56.3371796981786232`,55.1941913840778752`,58.176977299822985`,43.6192654350366293`,56.3317135761094434`,46.5749962190335775`,57.2616819648278152`,57.5743715370659359`,48.6130995465412851`,49.95030548360881`,54.8596378537502005`,54.48553045024493`,56.325836511485896`,65.8135218581346403`,56.2059392397873924`,54.8621720916546706`,51.9636926742639548`,47.9236398711068023`,58.0990974578286678`,58.068495904287829`,64.4569328231792582`,60.817941495157326`,58.4112809084606343`,57.7627909667267402`,54.8322807628436947`,65.5598387137431082`,53.4613823720706093`,61.1599853251450298`,54.7713455345396749`,55.8936216834111743`,58.2296365704702889`,60.7607575649556252`,61.9340911030061125`,51.9416696073070038`,51.3002491069007682`,55.0110178591803844`,49.4240181278456081`,45.6644766611337793`,56.1311372389311546`,51.3758892270080647`,60.8955202517900673`,55.4930473913574129`,53.6821596973888937`,53.5104910539038858`,63.6998677459192919`,50.4910009275205151`,54.4738816708129913`,55.7067761217943768`,41.9928746471291258`,40.7388159351084855`,59.0267880367749242`,67.048739730978184`,69.8040037050577133`,68.6512801676599337`,64.0310405329326837`,57.383617828875808`,58.0432937305404728`,64.7620448933510051`,50.3001519600464952`,56.2098367812951771`,44.5325503593688054`,51.9751900762374585`,55.8063583050005362`,53.0319480677684929`,47.8934162610827396`,52.1763320755473802`,70.7265492091385983`,68.0201233253989556`,47.3405735753253598`,40.4838429778083064`,40.8889301689321627`,47.8478855823648618`,74.2715288994964328`,60.3465098602155869`,52.6575345706396014`,59.5018244725314815`,56.2122677578673535`,55.8817368111780865`,49.767653238051599`,65.2778500837312414`,53.927697910507133`,48.7717445760276291`,60.4170456205929973`,49.9203207509851498`,61.9465675130373849`,64.3870841754472156`,61.0117887756293342`,60.1656252897116328`,53.1938861375244087`,54.4181430023759649`,62.8063812641234076`,56.0606018075855416`,59.2851616805715142`,53.9928575698307966`,49.4766207008397973`,59.4446025882648765`,59.0092264857490533`,53.0112050365960207`,60.5996860037928719`,57.5388528506742868`,60.0753612967183769`,54.8559384886665579`,53.834561922027877`,48.1346980328576545`,55.9375463020455132`,67.3065418276376359`,57.4682164366298131`,54.1612953635358707`,58.1469234267081702`,57.540091144948704`,55.7858444797382713`,45.090818961136474`,37.7187396870210944`,54.0001533155729696`,55.8224383259336498`,49.7783721721719452`,45.6044185155104919`,47.9750229454837295`,49.3614132906198577`,69.4907457306418052`,54.6524002277287124`,45.8030944715060073`,54.5698768402394307`,66.573102230661254`,57.1572204765310054`,47.9218941695718303`,51.7701067518406166`,54.1961334028560237`,44.207616458905603`,54.3771161132166991`,54.9752021170826488`,52.3075559220722841`,46.4499757523807943`,61.0389462043083419`,63.2556594397095484`,54.1388445210174396`,65.3500143506323549`,49.678904658256755`,56.7437077257486421`,59.2861667355647536`,51.295471553019496`,70.2480776272572349`,59.7271855768035564`,52.9868283534686579`,51.3395462011614966`,53.7469484722233215`,49.8151195148802905`,50.1627400929442401`,59.5139116588297145`,44.95527188279544`,61.8541456545919654`,58.1594298017118216`,52.6269961611143255`,75.5018039334822965`,53.3545027224418433`,59.6736078579247219`,59.507645187955207`,51.4502426277699953`,47.0158797869469413`,63.4996904550332796`,64.4982289049978607`,53.1880379002754821`,60.57978915621546`,64.9488764835881937`,49.8801702725546025`,47.7540230570243018`,54.4651153097747453`,63.3145326008051245`,62.4719632128169166`,59.3860061501442615`,47.9280254349912038`,42.8239820983733299`,54.1863012495443285`,66.3185570803243695`,48.7136187964722644`,50.2538859484790378`,66.744349863806951`,56.0293219445484602`,55.6933314107585264`,63.0220342255741883`,60.3480125457204419`,61.6717387627536961`,62.7703337456310794`,48.5737891317683878`,60.457988888112002`,68.8265498547757825`,46.0141430657511563`,29.352668748781463`,51.6817686054621283`,54.6454299375185215`,48.3706481178911928`,60.8406271550862953`,44.2096018995287298`,58.1218031929488621`,55.839841512656454`,45.8200433621346991`,57.0788847711058267`,58.9369333623571378`,57.6601569245881151`,58.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