Mathematics, 28.06.2019 05:30 johnnyhalusewa

The results of a national survey showed that on average, adults sleep 6.9 hours per night. suppose that the standard deviation is 1.2 hours and that the number of hours of sleep fol- lows a bell-shaped distribution. a. use the empirical rule to calculate the percentage of individuals who sleep between 4.5 and 9.3 hours per day. b. what is the z-value for an adult who sleeps 8 hours per night? c. what is the z-value for an adult who sleeps 6 hours per night?

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The results of a national survey showed that on average, adults sleep 6.9 hours per night. suppose t...