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The average completion time for one piece is 7.1 minutes with a standard deviation of 1.2 minutes. If completion times follow a normal distribution, how

The average completion time for one piece is 7.1 minutes with a standard deviation of 1.2 minutes. If completion times follow a normal distribution, how many minutes should it take to complete a piece in order to be in the lower 20% of the completion times distribution? in the upper 30% of the completion times distribution?

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