A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 127.2-cm and a standard deviation of 1.5-cm. For shipment, 8 steel rods are bundled together. Find...

A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 127.2-cm and a standard deviation of 1.5-cm. For shipment, 8 steel rods are bundled together.


Find the probability that the average length of a randomly selected bundle of steel rods is between 127.8-cm and 128.7-cm.

P(127.8-cm M < 128.7-cm)="">


Enter your answer as a number accurate to 4 decimal places.