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1- The students of a class have a mean height of 5.5 feet, with a standard deviation of 1.5 feet. What proportion of these students are between 5 and 6 feet tall?
2- People's monthly utility bills in Gainesville are normally distributed with a mean of 125$ and a standard deviation of 25$. In a complex of 120 apartments, how many would we expect to have a bill that is 100$ or less?