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The diameter of screws produced by a particular machine is normally distributed. Based on past experience, it is known that 30 percent of the screws

The diameter of screws produced by a particular machine is normally distributed. Based on past experience, it is known that 30 percent of the screws are less than 1.30 inches in diameter and that 40 percent of the screws is greater than 1.71 inches in diameter.

What is the mean diameter of screws produced by this machine?

What is the standard deviation of the diameter of the screws produced by this machine?

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