You must estimate the mean temperature (in degrees Fahrenheit) with the following sample temperatures:

54.6

62.4

73.7

51.9

86.1

81.4

75.1

57.4

Find the 80% confidence interval. Enter your answer as an open-interval (i.e., parentheses) accurate to two decimal places (because the sample data are reported accurate to one decimal place). 80% C.I. = Answer should be obtained without any preliminary rounding.