A company produces steel rods. The legnths of the steel rods are normally distributed with a mean of 154.9 cm and a standard deviation of 1.7cm. For shipment, 24 steel rods are bundled together. Find...

A company produces steel rods. The legnths of the steel rods are normally distributed with a mean of 154.9 cm and a standard deviation of 1.7cm. For shipment, 24 steel rods are bundled together. Find P21, which is the average length the smallest 21% bundles from the largest 79% bundles.