A teacher is deciding which measure of center describes the recent test scores of his Geography class. He asks his teammates to help him decide.

The test scores are as follows: 50,50,50,60,60,70,70,80,80,80,90,90 ,90

Eden says he should pick the median. Chen says he should pick the mean. Ellen says he should pick the mode. Hans says it does not matter, so he could pick the mean or the median. Immersive Reader
Who is correct?