Mattie works on an automotive line in detroit as a result of having to meet new safety laws, production has decreased 3,000 to 2,850 units per day, her manager wants a report that states the percent decrease in production.

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”?