You are looking at Summary Statistics for the amount of time it takes to install a furnace. You have concluded that the times to completion are distributed symmetrically. Your boss has asked you if there is a lot of variability in the times. You would say there is a lot of variability if a. the standard deviation divided by the mean is more than .5b.(Q3-Q1)/Median is more than .5 c.(Q3-Q1)/Mean is more than .05d. the mean divided by the standard deviation is greater than .5

An oil exploration company currently has two active projects, one in asia and the other in europe. let a be the event that the asian project is successful and b be the event that the european project is successful. suppose that a and b are independent events with p(a) = 0.2 and p(b) = 0.8. (a) if the asian project is not successful, what is the probability that the european project is also not successful? (b) what is the probability that at least one of the two projects will be successful? (c) given that at least one of the two projects is successful, what is the probability that only the asian project is successful? (round your answer to three decimal places.)