A machine fills containers with a mean weight per container of 16.0 ounces. If no more than 5% of the containers are to weigh less than 15.

A machine fills containers with a mean weight per container of 16.0 ounces. If no more than 5% of the containers are to weigh less than 15.7 ounces, what must the standard deviation of the weights equal? (assume normality). Note: This problem is very similar to problem 6.60 (page 334).