the sum of integers p and q is modeled on a number line, where |p| < |q|. in each box, write p, q or p + q. then write an addition equation using integers that could represent p, q and p + q

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”?