Work out the given below

With finding limits of multi variable !

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”?

Select the correct answer from each drop-down menu. what is the slope for the line p.and what is the slope for the line q