As of January 2014, 58% of American adults have a Smartphone and on average, spend 34 hours per month using the mobile internet on Smartphone.

A researcher became interested to estimate the unknown average hours students in a given university spend in the mobile internet on Smartphone. The researcher takes a sample of 10 students in the university. The sample data is given below:

39

42

47

45

35

45

37

34

33

29

Suppose that the population standard deviation of students spending in the mobile internet on Smartphone is 7.89.

A 95% CI of the population mean is