Solve clearly

QUESTION 1 1 points Bus waiting time is uniformly distributed with the shortest and the longest waiting times being 7:34 and 36.63 minutes respectively. What is the standard deviation of the average waiting time of 76 passenger QUESTION 2 1 points There are 71 players who play a chess game against the Computer, Each player plays 20 times and the probability that he/the wins is 0.32. Let Xj denote the number of times player i wins. What is the Standard Deviation of X where X is the sample average of a number of wins among 71 players? QUESTION 3 1 points The patient recovery time from a particular surgical procedure is normally distributed with a mean of 19 days and a standard deviation of 3.24 days. Let X - is the number of days a randomly selected patient needs to recover from the surgical procedure. What is the lower bound of 95% confidence interval of *