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Suppose that a random sample of adult maleshas a sample mean heart mass of x=310.1 grams, with a sample standard deviation of s=6.6 grams. Since

Suppose that a random sample of adult maleshas a sample mean heart mass of x=310.1 grams, with a sample standard deviation of s=6.6 grams. Since adult male heart masses are generally symmetric and bell-shaped, we can apply the Empirical Rule.

Between what two masses doapproximately 68% of the data occur?

Round your answer to the nearest tenth.

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