12. Happiness Groups of people aged 15-65 are randomly selected
and arranged in groups of six. The random variable x is the num-
ber in the group who say that their family and/or partner contribute
most to their happiness (based on a Coca-Cola survey).
WN - O
P(x)
0+
0.003
0.025
0.111
0.279
0.373
0.208

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