hello everyone right now i started at 9:30 mt and I have to do 3 hours of work I have to do a 30 minute zoom at 11 what time will I be done

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”?