Iris is building a model of the washington monument. her model measures 15 in. tall and is 1.5 in. wide at the base. the actual width measurement at the base of the washington monument is about 55 ft. about how tall is the washington monument?

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?