The amount of time to complete a physical activity in a PE class is approximately normally normally distributed with a mean of 38.1 seconds and a standard deviation of 7.6 seconds.
a) What is the probability that a randomly chosen student completes the activity in less than 33.9 seconds?
b) What is the probability that a randomly chosen student completes the activity in more than 47.1 seconds?
c) What proportion of students take between 33.8 and 42.9 seconds to complete the activity?
seconds.
d) 70% of all students finish the activity in less than