The following are the P/E ratios (price of stock divided by projected earnings per share) for 19 banks. 18, 25, 14, 31, 19, 21, 21, 23, 15, 29, 22, 23, 43, 22, 24, 22, 18, 20, 18 Find 10th and 75th percentiles for these ratios. (a) The 10th percentile: (b) The 75th percentile:

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters