=+4.43 A sample of concrete specimens of a certain type is selected, and the compressive strength of

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=+4.43 A sample of concrete specimens of a certain type is selected, and the compressive strength of each specimen is determined. The mean and standard deviation are calculated as 5 3000 and s 5 500, and the sample histogram is found to be well approximated by a normal curve.

a. Approximately what percentage of the sample observations are between 2500 and 3500?

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