Madison has 3 jobs. this week she earned $240 waitressing, $72 delivering mail, and $88 babysitting. what percent of her money came from waitressing?
33%
18%
60%
58%

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”?