The amount of time to complete a physical activity in a PE class is normally distributed with a mean of 35 seconds and a standard deviation of 5.4 seconds.  a) What is the probability that a randomly chosen student completes the activity in less than 31.7 seconds?  b) What is the probability that a randomly chosen student completes the activity in more than 39.9 seconds?  c) What proportion of students take between 32.7 and 38.3 seconds to complete the activity?  d) 85% of all students finish the activity in less than_____seco

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