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504 is two standard deviations above the mean. The empirical rule states that 95% of data values will be within two standard deviations of the mean. Because a bell-shaped distribution is symmetric, 0.5×(1-95%) = 2.5% of the data values will be greater than (mean + 2×standard deviation) 504. 2.5% of students use internet for more than 504 minutes. ................
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