The graph of y=f(x) is shown below. Over which of the following intervals is f(x) always increasing? 1) -7 2) -3 3) -5 4) -5

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”?