The times of runners passing a finishing line is normally distributed, with a mean time of 30 seconds and a standard deviation of 10 seconds. What is the probability that the next runner takes less than 40 seconds? 0.5 because the Normal is symmetric O 0 because it is a continuous random variable O 0.159 CO 0.841 D Question 18 1 pts The mean and variance of four e-commerce stocks is given below. Which stock should be chosen? B D O stock C O stock B O stock A stock D Mean % return Variance % return (squared) 16 25 1 19