short and quick answer, please, i do not have much time

2. A random sample of 300 USIM students found that the average distance to a stu- dent's hometown was 125 km. The standard deviation for the distance for all students at the USIM is 40 km. a) Find the value of: i. E (1 marks) ii. n (1 marks) ili. o (1 marks) b) Construct the confidence interval for the average distance to a student's home- town if 90% is the confidence level. (10 marks) c) Interpret the results you got in 2(b). (2 marks) [Total : 15 Marks]