How do the volatilities of methane, methyl bromide, methylene bromide, bromoform, and tetrabromomethane, relate to their dipole moments?
Both methane and methyl bromide are gases. As to the volatilities of the other, you are going to have to consult the literature.
Even in 1st year chemistry at university, this question would never be asked without quoting the boiling points of the methane derivatives. You might be asked to account for the given volatilities on the basis of dipole moment, but with no data provided your guess is as good as mine.