I need part c done in the 2nd screenshot too and rounded to two decimal places

The grade point averages (GPA) for 12 randomly selected college students are shown on the right. Complete parts (a) through (:3) below. Assume the population is normally distributed. (a) Find the sample mean. x = (Round to two decimal places as needed.) (b) Find the sample standard deviation. 2.2 1.5 2.5 0.3 3.2 0.8 1.4 2.3 2.9 % 4.0 3.9 3.5 In a survey of 2350 adults, 722 say they believe in UFOs. Construct a 99% confidence interval for the population proportion of adults who believe in UFOs. A 99% confidence interval for the population proportion is (Round to three decimal places as needed.) Interpret your results. Choose the correct answer below.Construct a 99% confidence interval for the population proportion of adults who believe in UFOs. O A. With 99% confidence, it can be said that the population proportion of adults who believe in UFOs is between the endpoints of the given confidence interval. O B. The endpoints of the given confidence interval shows that 99% of adults believe in UFOs. O C. With 99% probability, the population proportion of adults who do not believe in UFOs is between the endpoints of the given confidence interval. O D. With 99% confidence, it can be said that the sample proportion of adults who believe in UFOs is between the endpoints of the given confidence interval.The grade point averages (GPA) for 12 randomly selected college students are shown on the right. Complete parts (a) 2.2 3.2 2.9 through (c) below. 1.5 0.8 4.0 Assume the population is normally distributed. 2.5 1.4 3.9 0.3 2.3 3.5 (b) Find the sample standard deviation. S = (Round to two decimal places as needed.) (c) Construct a 90% confidence interval for the population mean u. Enter your answer in each of the answer boxes