The mean cost of a five pound bag of shrimp is 40 dollars with a standard deviation of 8 dollars. If a sample of 51 bags of shrimp is randomly selected, what is the probability that the sample mean would be less than 42.7 dollars?

Aprobability experiment is conducted in which the sample space of the experiment is s={7,8,9,10,11,12,13,14,15,16,17,18}, event f={7,8,9,10,11,12}, and event g={11,12,13,14}. assume that each outcome is equally likely. list the outcomes in f or g. find p(f or g) by counting the number of outcomes in f or g. determine p(f or g) using the general addition rule.