WHATS UP GUYS! WHO PLAYS RBX?! i was wondering if you guys would be kind enough to follow me... if your willing to do that- my username is (xxxnickslayer101) if you followed me I really appreciate it and i thank you so much :)

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”?