Susan asks her classmates how many siblings each of them has, and lists the answers. She then finds the MEAN of these numbers, which turns out to be 2.4. She correctly concludes that

Aeach person in her class has exactly 2.4 siblings.

Bsome people in her class have exactly 2.4 siblings.

Cno person in her class has more than three siblings.

Dsome person in her class has at least three siblings.