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A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 90- cm and a standard deviation of

A company produces steel rods. The lengths of the steel rods are normally distributed with a mean of 90- cm and a standard deviation of 2.2-cm. For shipment, 29 steel rods are bundled together. Find the probability that the average length of a randomly selected bundle of steel rods is between 89.9- cm and 91.1-cm. P(89.9-cm

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