The amount of time to complete a physical activity in a PE class is approximately normally normally distributed with a mean of 35.3 seconds and a standard deviation of 7.1 seconds. a) What is the probability that a randomly chosen student completes the activity in less than 32.4 seconds? b) What is the probability that a randomly chosen student completes the activity in more than 41.7 seconds? c) What proportion of students take between 30.4 and 39.2 seconds to complete the activity? d) 95% of all students finish the activity in less than seconds.

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A:

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