The amount of time to complete a physical activity in a PE class is approximately normally normally distributed with a mean of 37.9 seconds and a standard deviation of 5.6 seconds. a) What is the probability that a randomly chosen student completes the activity in less than 34.3 seconds? b) What is the probability that a randomly chosen student completes the activity in more than 44.3 seconds? c) What proportion of students take between 34.7 and 42.3 seconds to complete the activity? d) 70% of all students finish the activity in less than seconds. Question Help: Message instructor