The amount of time to complete a physicał activity in a PE class is normally distributed with a mean of 38.6 seconds and a standard deviation of 6.3 seconds. Round answers to 4 decimal places. a) What is the probability that a randomly chosen student completes the activity in less than 34.9 seconds? b) What is the probability that a randomly chosen student completes the activity in more than 45.8 seconds? c) What proportion of students take between 33.7 and 42.2 seconds to complete the activity?

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