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An item has an average thickness of 7.9 m, with a standard deviation of 0.4 m....

An item has an average thickness of 7.9 m, with a standard deviation of 0.4 m.

- What range does about 68% of the item fall within?

- If you wanted 95% of the materials to fall within the range 7.7m and 8.15 m, what mean and the standard deviation is needed

Math   Statistics-And-Probability   
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