This is a question about statistics

Problem 4. Here is a sample of ACT scores (average of the Math, English, Social Science, and Natural Science scores) for students taking college freshman calculus: 24.00 28.00 27.75 27.00 24.25 23.50 26.25 24.00 25.00 30.00 23.25 26.25 21.50 26.00 28.00 24.50 22.50 28.25 21.25 19.75 a. Use an appropriate graph to check if it is plausible to assume that the sample follows a normal distribution. b. Calculate a two-sided 95% condence interval for the population mean