The Post Office has established a record in a major Midwestern city for delivering 90% of its local mail the next working day when there are 8 local letters mailed .What is the probability that the number of delivered will be within 2 standard deviations of the mean?
A).9950
B).9619
C).8131
D).9996

Question

Quizplus · Accepted Answer

P(7.2 F1F1F1S1F1F1F10 2(.85))= p(7.2 F1F1F1S1F1F1F10 1.7)= P(5.5 F1F1F1S1F1F1F10 x F1F1F1S1F1F1F10 8)= P(6 F1F1F1S1F1F1F10 x F1F1F1S1F1F1F10 8)= (.4305)+ (.3826)+ (.1488)= .9619

The Post Office Has Established a Record in a Major