The temperature at any random location in a kiln used for manufacturing bricks is Normally distributed with a mean of 1000F and a standard deviation of 50F.

(a) If bricks are fired at a temperature above 1125F, they will crack and must be discarded. If the bricks are placed randomly throughout the kiln, what is the percentage of bricks that crack during the firing process?

(b) When glazed bricks are put in the oven, if the temperature is below 900F they will discolor. If the bricks are placed randomly throughout the kiln, what percentage of glazed bricks will discolor?