Hi both are idiomatic
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Alienvoord"Why do both plural and singular make sense there? ?" Maybe because "their" can refer to both singular and plural antecedents.And perhaps sometimes their mind is same, while other times their minds are different, but all been made up then.[:-P]
MrPedanticSimilarly, it's possible that some speakers would choose "make up their mind" when each person had to make the same decision, but "make up their minds" when the decisions related to different matters.
TeoWhich is correct, make up their mind or make up their minds?Both, but they are different