What is the algebra to get expression for the following word phrase the quotient 3 and z

Select the two pairs of figures that are similar.

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”?

What is fraction that is equivalent to 3/8