A company produces steel rods. The length of the steel rods are normally distributed with a mean of 246.5 cm and a standard deviation of 1.3 cm. For shipment, 39 steel rods are bundled together. Round all answers to four decimal places if necessary.  For a single randomly selected steelnrod, find the probability that the length is between 246.2cm and 246.5 cm.  For a bundled of 39 rods, find the probability that the average length is between 246.2cm and 246.5 cm.

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.