The minimum fine for driving in excess of the speed limit is $25. an additional $6 is added to the minimum fine for each mile per hour (mph) in excess of the speedlimit. rachel was issued a $103 fine for speeding in a 55-mph speed limit zone. for driving at what speed, inmph, was rachel fined?

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”?