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Data from Ivy Tech's advising center shows that their wait times follow a normal distribution 35 min. 8. What percent of students will wait between 15 and 25 minutes? 9. What proportion of will wait less than 20 minutes? 10. What is the probability that a student will wait more than 35 minutes? Do not round. 11. The week before classes started, 250 students were seen in the advising center. How many students had to wait between 15 and 20 minutes? 12. Professor Pete's calculus class has the following scores: 19 21 31 32 37 45 52 55 62 63 63 65 65 77 78 As you can see, more than half of the class would fail the class if a standard grade scale were used. That is why he is going to pass anyone who scores higher than 1 standard deviation below the mean. Use Excel to find the standard deviation and mean. Save As with last name, first name, hw15 and Submit the file in HW 15, Open Response. Round to two decimal places. 12 a. Standard deviation: Mean: meaningful sentence. 12 b. Find the new (lowest) passing grade for Professor Pete's class. Round to 2 decimal places. Use the value in a Use Excel to find the mean and standard deviation of the following data sets then answer the questions. Note: You will need to use the z-table from the class session to work the following problems. Body temperature measured in degrees Fahrenheit of randomly selected normal/healthy adults: 98.6 98.6 98.0 99.0 98.4 98.4 98.4 98.7 98.9 98.8 13. The mean body temperature is (Round to one decimal place) 14. The standard deviation of the body temperatures is (Round to one decimal)