D'apres une enquete mene par la federation canadienne de l'entreprise independente, il coute en moyenne 1500$ pour les entreprises quebecoise qui comptent entre 20 et 49 employs pour se conformer aux diverses legislations comme la loi sur l'impot et le revenu. On choisit au hasard 36 entreprises ayant entre 20 et 49 employes. on admet l ecart type de couts de conformite est de 120$ et que le cout moyen de l ensemble de l'entreprise comptant entre 20 et 49 employes est celui ci mentionne ci haut

Quelle est la probabilite moyenne echantillonale soit superieure 1490

eng : According to a survey conducted by the Canadian Federation of Independent Business, it costs an average of $1500 for Quebec businesses with 20 to 49 employees to comply with various legislation such as the Income Tax Act. We randomly select 36 businesses with between 20 and 49 employees. We assume that the standard deviation of compliance costs is $120 and that the average cost for all businesses with between 20 and 49 employees is the one mentioned above

What is the average probability that the sample is greater than 1490