The width of a slot of a duralumin forging is (in inches) normally distributed with = 0 : 900 and = 0 : 003. The specication limits were given as 0 : 900 0 : 005. (a) What percentage of forgings will be defective? (b) What is the maximum allowable value of that will permit no more than 1 in 100 defectives when the widths are normally distributed with = 0 : 900 and ?