11 1 point The arrival times of a particular rush-hour commuter train are normally distributed. The mean arrival time is 8:47 a.m. The standard deviation of arrival times is 4 minutes. Find the probability that on a randomly chosen day, the train arrives after 8:39 a.m. Use the empirical rule Type your answer.. 12 1 point One student rolls a fair number cube 20 times and records the probability of each result in a histogram. Another student rolls the same number cube 120 times and records the probability of each result in a histogram. Which histogram is more likely to approximate a normal curve? Explain. Both should approximate the normal distribution curve, but the lower number of bars in the histogram for 20 rolls will make that histogram look more like a curve. Only the histogram for 120 rolls will approximate the normal curve. The histogram for 20 rolls will better approximate a uniform distribution. Only the histogram for 20 rolls will approximate the normal curve. The histogram for 120 rolls will increase at an increasing rate from left to right. Both should approximate the normal distribution curve, but the increased number of bars in the histogram for 120 rolls will make that histogram look more like a curve. Clear my selection