No. of She 2. a) The amount of pocket money in Rs) brought by 20 students of class VII on a day are given below. Let's construct a frequency distribution table with tally marks. 30, 40. 25, 35. 40. 40. 30. 25, 20 40. 45. 35. 40. 30. 40, 30, 50. The numbe Draw a sin Classes​

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