On a bicycle trail, the city is painting arrows like the one shown below: upper pointing arrow with height of 11 and length of 9. rectangular base of arrow has length of 7 and height of 8. all units are in centimeters. calculate the area of the arrow by decomposing it into rectangles and triangles. 66.5 square centimeters 69.5 square centimeters 83 square centimeters 99 square centimeters

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.