Question 19 (1 point) Consider the following probability distribution for a random variable X. X 4 6 10 p(x)0.16 0.56? where the question mark represents a missing probability. Find the missing probability, then find the standard deviation of the random variable X. What is the standard deviation of X? (Give your response to at least 3 decimal places. Include only the numeric response, and not any extra characters or symbols.) Your Answer: Your Answer Question 20 (1 point) Suppose we are interested in calculating a 90% confidence interval for the mean of a normally distributed population. We've drawn a sample of 10 observations from this population, and found a sample mean of 350.4 and a sample standard deviation of 22.0. What is the appropriate upper endpoint of the 90% interval for mu? (e.g. If the interval is (3.712,9.674), give 9.674 as your response.) (Give your response to at least 3 decimal places. Give only your numeric response, and no extra characters or symbols.) Your Answer: Your Answer Question 21 (1 point) Saved