A study of the ages of motorcyclists killed in crashes involves the random selection of 168 drivers with a mean of 36 84 years. Assuming that e-55 years, construct and interp a 99% confidence interval estimate of the mean age of all motorcyclists killed in crashes Click here to view.at.distribution table. Click here to view.page.1.ot the standard normal distribution table. Click here to view.page.2.of the standard normal distribution table. What is the 99% confidence interval for the population mean p?