Can you pls help me solve this ?

10. Ellan University claims the mean class load for their faculty is no longer 23 students. Ray randomly select 16 classes and recorded the class size of each. At a 7% level of significance, does the data support EU's claim? Ray's data: 15, 20, 25, 26, 18, 25, 29, 26, 15, 23, 22, 20, 21, 14, 22, 21. (s = 4.334) (EU class size is normally distributed) a) Ho. b d)