A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 103.5-cm and a standard deviation of 0.9-cm. For shipment, 6 steel rods are bundled together. Find P80, which is the average length separating the smallest 80% bundles from the largest 20% bundles.

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.