= 12:08 coursehero.com 1 Helpful Search Q C Unhelpful 4G 4 ↑ m page 1 of 4 Key Name Date Statistics Unit 7 Test B In problems 1-6, suppose that the number of coffees a student drinks per week has a mean = 10 coffees with a standard deviation σ = 1.2 coffees. Use the empirical rule (68-95-99.7 Rule) to answer each question. 1. 50% 2.5% 2. 1. What percentage of students drink more than 10 coffees per week? (50% 18.5% 3. .3% 76 88 10 11224 13.6 4. 2. What percentage of students drink less than 7.6 coffees per week? 5. 128 2.5% 3. What percentage of students drink more than 12.4 cups of coffee or less than 8.8 cups of coffee per 6. 585 week? 16% 8.810 124 25 18.5% 4. What percentage of students drink between 6.4 and 13.6 cups of coffee per week? 1-.997 .003 (3%) 5. Suppose that there are 800 students in the school. About how many of them drink more than 11.2 cups of coffee per week? 16% = 800 (16)=128 6. Suppose that there are 600 students in the school. About how many of them drink less than 12.4 cups of coffee per week? 1-.025 = 975 600/975)=(585 < > 5