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I was reading a Wiki page which had this statement:

recall is the fraction of relevant instances that are retrieved

Shouldn't it be the following?

recall is the fraction of relevant instances those are retrieved

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No, the base of the construction is "<noun> is the fraction that are retrieved." – Jim Feb 5 '13 at 5:22
Never sure of the rules for "that are" or "which are" - but one of those is correct – mgb Feb 5 '13 at 6:24
The answer is 'No' to those. However, do let us know why you thought that was incorrect and those was the right word instead. That will help answer the question. You can also follow our sister site ELL that will be very helpful to you: area51.stackexchange.com/proposals/41665/… – Kris Feb 5 '13 at 7:41
You will find some interesting explanation here: usingenglish.com/forum/ask-teacher/149623-vs-those.html – Kris Feb 5 '13 at 7:47

The answer is no to those. The plural of that is those, that is for sure, but here that is used as a relative pronoun, used to identify fraction of relevant instances. There is no use of those as a relative pronoun.

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