Looking for help on question B

The Wicomico County Board of Education is in the process of developing a new exam to evaluate the reading level of all fourth-graders in the county. To pilot the exam, it was administered to 20 randomly chosen fourth-graders from the county. This sample of students had a mean exam score of 72.3 and a standard deviation of 9.7 points. a) Assuming that the population of exam scores is normally distributed, construct and interpret a 98% confidence interval to estimate the mean exam score for the population of Wicomico County fourth-graders. b) Does your confidence interval provide sufficient evidence for the county to conclude that the mean exam score for the population of county fourth-graders is below 80 points? Explain