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Chebyshev's theorem - standard deviation

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A scientific calculator operates on the average 5.3 hour before needing a recharge. According to Chebyshev's theorem, if the operating times have a standard deviation of 0.6 hour.
A. Between what 2 values will at least 75% of the operating times fall?
B. At least what percentage of the operating times will fall in the interval from 3.5 to 7.1 hours?

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Solution Summary

The solution addresses the fact that a scientific calculator operates on the average 5.3 hour before needing a recharge. According to Chebyshev's theorem, if the operating times have a standard deviation of 0.6 hour.
A. Between what 2 values will at least 75% of the operating times fall?
B. At least what percentage of the operating times will fall in the interval from 3.5 to 7.1 hours?

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Problem:
Chebyshev's theorem----standard deviation
A scientific calculator operates on the average 5.3 hour before needing a recharge. According to Chebyshev's theorem, if the operating times have a standard deviation of 0.6 hour.
A. Between whAT 2 VALUES WILL AT LEAST 75% OF THE OPERATING TIMES FALL?
B. AT LEAST WHAT PERCENTAGE OF THE OPERATING TIMES WILL FALL IN THE INTERVAL FROM ...

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