The expression rt can be used to find the distance traveled by an object that has an average speed of our overtime t how many miles will a hot air balloon travel in 2.2 hours if it travels at an average speed of 12.5 miles per hour

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”?