Astudy at a college in the west coast reveals that, historically, 45% of their students are minority students. if a random sample of size 75 is selected, the probability is that between 30% and 50% of the students in the sample will be minority students.

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