Ineed . first answer that explains well gets to be marked brainlist. extra points

The empirical probability of a 4 or 5 is
  (count of outcome = 4 or 5)/(count of all outcomes) = (44 +40)/240 = 7/20

The problem statement asks you to assume the outcomes will remain in this proportion going forward. That is, the number of outcomes (n) of 4 or 5 in the next 60 rolls of the number cube is expected to satisfy
  7/20 = n/60

Multiplying that by 60 gives
  n = 60*(7/20) = 21

Selection D is appropriate.

This makes absolutely no sense at all young man/women