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

21

44.8

47.9

58.9

41.3

57.4

45.4

41.1

32.4

28.6

49.3

You believe the population is normally distributed. Find the 95% 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).

95% C.I. =

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