Acontractor records all of the bedroom areas, in
square feet, of a five-bedroom house as:
100, 100, 120, 120, 180
what is the variance?
what is the standard deviation?
done

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