Could show me step plz. The answer I get is 27.01 & 35.28. But it isn't right.

(a) Biologists studying the healing of skin wounds measured the time taken for new cells to close a razor cut made in the skin of an anesthetized newt. Below are the data from 7 newts. 25, 24, 31, 34, 29, 36, 39 Find a 95% condence interval for the mean healing time for all newts of this species. (I1) Which of the following statements is true regarding part (a)? confidence interval 2101,3523 enter your answer in the form a,b (numbers correct to 2 decimals) (A) The population does not need to be normal. (B) The population must be normal. (C) The population mean must be inside the condence interval. (D) The population must follow a t-distribution. (E) The population standard deviation 6 must be known