The amount of time to complete a physical activity in a PE class is normally distributed with a mean of 39.1 seconds and a standard deviation of 5.2 seconds. Round answers to 4 decimal places. a) What is the probability that a randomly chosen student completes the activity in less than 32.7 seconds? b) What is the probability that a randomly chosen student completes the activity in more than 45.4 seconds? c) What proportion of students take between 36.8 and 41.8 seconds to complete the activity? d) 90% of all students finish the activity in less than seconds.

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