For every two feet the ramp goes up it also goes 5 feet forward. if this ratio remained constant, how many feet high would the ramp be if it went 22.5 feet forward?

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”?