statistics question

Question

You intend to estimate a population mean μμ with the following sample.

42.1
48.1
54.2
65.1
46.7
50.9
29.6
46.6
48
31.9
40
35.3

You believe the population is normally distributed. Find the 80% confidence interval. Enter your answer as an open-interval (i.e., parentheses) accurate to twp decimal places (because the sample data are reported accurate to one decimal place).

80% C.I. =  

Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.

Answer 1

80% C.I. = (41.36,48.39)