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Of 1000 randomly selected machine-made metal pins, 65 were found to have a diameter less than 2.99 cm and 84 to a diameter exceeding 3.01

Of 1000 randomly selected machine-made metal pins, 65 were found to have a diameter less than 2.99 cm and 84 to a diameter exceeding 3.01 cm. Assume that the diameter is normally distributed. Estimate the waiting value and the variance in the distribution for the diameter using the given data. Management: First, estimate the probabilities of the specified events.

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