Un entrepreneur de réparation de fondations promet de fournir gratuitement un devis à tout client potentiel qui le demande. Un devis lui coûte 22 S (en temps
d'inspection et de préparation) mais n'aboutit à un contrat que 20 % des fois. Un contrat, cependant, lui rapporte en moyenne 200 $ net (après déduction du
coût du devis).
Soit X: gain total net après avoir reçu 10 demandes de devis. Déterminer E(X) + 20 x

Acell phone company offers two plans to its subscribers. at the time new subscribers sign up, they are asked to provide some demographic information. the mean yearly income for a sample of 40 subscribers to plan a is $45,000 with a standard deviation of $9,200. for a sample of 25 subscribers to plan b, the mean income is $64,300 with a standard deviation of $7,100. at the 0.025 significance level, is it reasonable to conclude the mean income of those selecting plan b is larger? assume unequal population standard deviations. hint: for the calculations, assume the plan a as the first sample. what is the decision rule? (negative amount should be indicated by a minus sign. round your answer to 3 decimal places.) compute the value of the test statistic. (negative amount should be indicated by a minus sign. round your answer to 2 decimal places.) what is your decision regarding h0 ? reject h0 fail to reject h0 compute the p-value. less than 0.01 between 0.01 and 0.025 between 0.025 and 0.05 between 0.05 and 0.10 greater than 0.10

35 ! insert < , > , or = to make the sentence true. 12 __ 25 > =

F(x) = x^2+x-2/x^2-3x-4 what is the domain and range, x-and y-intercepts, horizontal asymptotes, and vertical asymptotes?