Answer Happy

2-Scores and Area under the Curve The National Sleep Foundation recommends that adults between 18-64 years of age sleep between 7 and 9 hours per night. A researcher collected data on the amount of sleep that students in college slept per night. The data were approximately normally distributed with the following mean and standard deviation mean - 7.4 hours Standard deviation - 1.6 hours Use this information and the online normal distribution calculator to answer the questions below. Round your percents to two decimal places. Note: Use z-scores rounded to two decimal places and the standard normal distribution to avoid roundoff errors. Normal Calculator What percent of students slept between 8 hours and 10 hours? What percent of students slept less than 8.2 hours? What percent of students slept more than 9.3 hours? What percent of students slept less than 3.16 hours or more than 11.96 hours? Question Help: Written Example