employees in 2012 paid 4.2% of their gross wages towards social security (fica tax), while employers paid another 6.2%. how much will someone earning $23,000 a year pay towards social security out of their gross wages?

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”?