Which Numbers Describe, Which Infer?

A professor has the final-exam scores of all 50 students in her own class. Her report contains exactly four numbers:

• (i) The mean score of her 50 students: $62.4$
• (ii) The standard deviation of those same 50 scores: $11.2$
• (iii) A claim that the mean score of all $10{,}000$ students in the university who sat the same paper lies between $59.8$ and $65.0$
• (iv) The percentage of her 50 students who scored above $70$: 24%

She measured nobody outside her own class.

Classify each of the four as descriptive or inferential.