Susan said to find the total cost of a $250 dollar bycicle and the 7% tax, you could figure 7% of $250 and then add that amount to $250.

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”?