Question: Consider a sample with data values of 53, 55, 70, 58, 64, 57, 53, 69, 57, 68, and 53. 1. The results of a national

Consider a sample with data values of 53, 55, 70, 58, 64, 57, 53, 69, 57, 68, and 53. 1. 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 follows 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 night. b. What is the percentage of individuals that sleep more than 8.1 hours per night. c. What is the z-value for an adult who sleeps 8 hours per night?

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