7.EOC.52-E Question Help V a The average starting salary for an MBA graduate in the class of 2018 was $120,000. Assume the population standard deviation for starting MBA salaries was $16,000. A random sample of 50 MBA graduates from the class of 2018 was selected. a. What is the probability that the sample mean is less than $124,000? b. What is the probability that the sample mean is more than $116,000? 6. What is the probability that the sample mean is between $120,000 and $124,000? d. Suppose the sample mean was $121,500. Does this result support the average starting salary ndings? 7.EOC.53-E Question Help V a A road averages 2,665 vehicles per day with a standard deviation of 555 vehicles per day A trafc counter was used on this road on 31 days that were randomly selected. a. What is the probability that the sample mean is less than 2,500 vehicles per day? I). What is the probability that the sample mean is more than 2,700 vehicles per day? c. What is the probability that the sample mean is between 2,600 and 2,800 vehicles per day? d. Suppose the sample mean was 2,900 vehicles per day. Does this result support the stated population mean for this road? 7HE0055-E Question Help V a In 2016 Americans owed $1.3 trillion in student loans. The default rates of college student loans determine eligibility for oolleges to receive federal student aid. According to the Department of Education, an average of 11.9% of Americans who had student loans defaulted on their loans. A random sample of 215 reoent graduates was randomly selected. Complete parts a through d below. a. What is the probability that 10% or less of this sample has defaulted on their student loans? The probability is . (Round to four decimal plaoes as needed.) 7.EOC.57-E Question Help V at The average licensed driver travels 1.348 miles per month in his or her vehicle. Assume the population standard deviation is 460 miles per month. Determine the interval that will contain 93% of the sample means for the sample sizes in parts a through c. a. 30 drivers h. 40 drivers 6. 50 drivers d. Explain the differences in these probabilities. at Using a sample size of 30 the lower bound of the symmetrical interval is (Type an integer or decimal rounded to one decimal place as needed.) and the upper bound is 7.EOC.58 E Question Help V at Obtaining a driver's lioense at the earliest eligible age has been a teenage ritual that appears to be fading. A study performed by a university's transportation research institute recently found that 28% of U.S. teenagers between the ages of 17 and 19 did not possess a driver's license. A random sample of 150 17-to-19-year-old teenagers was selected. Complete parts a through d. a. What is the probability that 45 or fewer teenagers of this sample had not obtained a driver's license? The probability is , (Round to four decimal places as needed.) 7.EOC.59-E Question Help V at Suppose a person is employed at a oollege in which 51% of the student population is female. They are currently teaching statistim to 125 students this semester. They would like to select 50 students randomly from this group to participate in one of their research projects Complete parts a through d below. a. What is the probability that 30 or more students in their sample will be female? The probability is . (Round to four decimal places as needed.)