Average talk time between charges of a given cell phone
Average talk time between charges of a given cell phone is advertised as 4 hours. Let the standard deviation be 0.8 hour.
a. Use Chebyshev’s theorem to approximate the proportion of cell phones that will have talk time between 2.4 hours and 5.6 hours.
b. Assume a bell-shaped distribution to approximate the proportion of cell phones that will have talk time between 2.4 hours and 5.6 hours.

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