statistics

D Question 14 2.5 pts Scores on a particular test are normally distributed with a mean of 64.6 and a standard deviation of 15.0. Suppose you take a sample of size 100 of test scores and find that the mean is 63.1. What is the -score corresponding to this sample mean? BY-15 C)-0.1 D) -1.0 OC O B OD OA D Question 15 2.5 pts A sample of nine students was selected from among the students taking a particular exam. The nine students were asked how much time ( in hours) they had spent studying for the exam and the responses were as follows: 18. 7, 10, 13, 12, 16, 5, 20. 21 Estimate the mean study time of all students taking the exam. Round your answer to the nearest tenth of an hour if necessary. A) 13 hours B) 12.2 hours C) 13.6 hours D) It is not possible to estimate the population mean from this sample data OA OD Type here to search a