Every 40th student who enters the school is asked to name their favorite sport. Is this sample valid?

I would say No

Step-by-step explanation:

For a sample to be valid it needs to be random, and when doing every 40th student then its not random anymore, also when your doing every 40th student, to even have enough date their would have to be about 500 kids therefore it's not valid I feel.

i dont know what you want me to answer for this but im guessing 2: 11?