Which equation represents a line perpendicular to the line shown on the graph? 8
8
4
8
х
O y=44-1
O y=-4x+

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”?