The results of a national survey showed that on average, adults sleep 7.1 hours per night. Suppose that the standard deviation is 1.5 hours and that the number of hours of sleep follows a bell-shaped distribution. If needed, round your answers to two decimal digits. If your answer is negative use “minus sign”.
(a) | Use the empirical rule to calculate the percentage of individuals who sleep between 4.1 and 10.1 hours per day. |
Enter your answer as a percentage. | |
% | |
(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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