having trouble solving the problem

Question The speeds of vehicles traveling on a highway are normally distributed with a population standard deviation of 7 miles per hour and an unknown population mean, If a random sample of 20 vehicles is taken and results in a sample mean of 60 miles per hour, find a 98% confidence interval for the population mean. Zo.10 Zo.05 20.025 20.01 Z0.005 1.282 1.645 1 960 2.326 2.575 You may use a calculator or the common z values above. . Round the final answer to two decimal places Provide your answer below