French phrase
Quel est l'effectif moyen d'une classe de ~ ?
Meaning
What is the average class size for a ___ class?
When to use it
Asks about the typical number of students in a class. It is slightly formal and suits academic contexts.
Example dialogue
Quel est l'effectif moyen d'une classe de première année de licence ?
What is the average class size for a first-year undergraduate class?
En général, 20 à 30 étudiants.
Generally, 20 to 30 students.