Collective nouns such as jury, committee, audience, crowd, class, troop, family, team, and couple name a class or group. Ordinarily the group functions as a unit, so the noun should be treated as singular.
AS A UNIT
If the members of the group function as individuals, however, the noun should be treated as plural.
AS INDIVIDUALS
When treating a collective noun as plural, many writers prefer to add a clearly plural antecedent such as members to the sentence:
Often you can choose whether to treat a collective noun as singular or plural depending on your meaning.
There is no reason to draw attention to the individual members of the jury, so jury should be treated as singular.
Make sure that you are consistent within the sentence. In the previous example, the writer treated jury as singular when choosing the verb has, so for consistency the pronoun must be its.
Exercises:
Pronoun-antecedent agreement 1
Pronoun-antecedent agreement 2
Pronoun-antecedent agreement 3
Pronoun-antecedent agreement 4