Answer:
Population parameter
Explanation:
We are given the following in the question:
74% of all instructors at your school teach 2 or more classes.
Parameter and statistic:
- Parameter is the value that describes a population.
 - Population is the collection of all the possible observations of an event.
 - Statistic is the quantitative value that describes a sample.
 - A sample is a part of a population and is always smaller than a population.
 
Population:
 all instructors at your school
Parameter: 
74% of all the instructors at your school teach 2 or more classes
Thus, 74% describes the population that takes two or more classes.
Hence, it is a population parameter.