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Nouns that are "collective" (automatically suggesting a group) take a plural verb when the group as a whole is meant; they take a singular verb when the group can be thought of as individual members. Commonly used collective nouns include "number," "majority," "series," and "variety." Note that when collective nouns refer to a singular group as a whole they are often preceded by the word "a"; when they suggest individual group members they are often preceded by the word "the."

“A number of people were affected by the tragedy.”

Special Cases in Subject Verb Agreement
PennState College of Earth & Mineral Sciences: John A Dutton e-Education Institute

Is this information wrong?
I found this article online and isn’t it the other way around? Should you use collective nouns that refer to a whole group with singular verbs and the individuals with plural verbs? Should the example above be “a number of people was affected by the tragedy?”

tchrist
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Justin
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  • Both 'a [huge] majority of the people was affected' (cf 'the nation as a whole was affected') and 'a majority of the people were affected' (cf 'most / two thirds of the people were affected') are grammatical under the 'logical agreement' rule which I'd say virtually all Anglophones accept, if to different extents. The choice is the writer's: do you want the hearer to focus merely on the stats, or to pick up a hint of all those individuals involved? BUT 'a number of ...' always takes a plural verb form, and 'some of ...' (for count situations, not mass) is a reasonable comparator. – Edwin Ashworth Mar 26 '23 at 14:54

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