Question 7 0/ 10 pts 5 3 0 Details Assume that a sample is used to estimate a population mean /. Find the 90% confidence interval for a sample of size 35 with a mean of 77.5 and a standard deviation of 12.7. Enter your answer as an open- interval (i.e., parentheses) accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). 90% C.I. = Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places