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6) Marks (1%) It is known that the length of a certain steel rod is normally distributed with a mean of 100 cm and a

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6) Marks (1%) It is known that the length of a certain steel rod is normally distributed with a mean of 100 cm and a standard deviation of 0.45 cm. Suppose the manufacturer wants to accept 99% of all rods manufactured. Determine the length of rods that make up the middle 99% of all steel rods manufactured. 7) Marks (1%) Find the value of zo.33

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