(Solution) - The number of vehicles leaving a highway at a certain -(2025 Original AI-Free Solution)

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The number of vehicles leaving a highway at a certain exit during a particular time period has a distribution that is approximately normal with mean value 500 and standard deviation 75. What is the probability that the number of cars exiting during this period is
a. At least 650?
b. Strictly between 400 and 550? (Strictly means that the values 400 and 550 are not included.)
c. Between 400 and 550 (inclusive)?