Which of the following sets are equal to {x | x 2} Question 2 options: {3, 4, 5, 6, 7, 8} {2, 3, 4, 5, 6, 7, 8, 9} {8, 7, 6, 5, 3} { } {2, 3, 4, 5, 6, 7}

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”?