1- A restaurant supply company has a large number of machines that produce chopsticks for restaurants. The length of a particular chopstick produced by a randomly chosen machine has a normal distribution with a mean of u centimeters and a standard deviation of .2 centimeters, where u has a normal distribution with a mean of 20 centimeters and a standard deviation of o centimeters. Over a long period of time, it is found that 95% of all chopsticks produced are between 19.3 and 20.7 centimeters long. Find o