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Bloom (the same one from Bloom's Taxonomy), in a paper called "The 2 Sigma Problem: The Search for Methods of Group Instruction as Effective as One-to-One Tutoring", from 1984, states that:
"[...] under the best learning conditions we can devise (tutoring), the average student is 2 sigma above the average control student taught under conventional group methods of instruction" (p. 4)
This simply means that the average student, under tutoring performed two standard deviations better in students in the control group, learning in a classroom setting. In numbers,
"the average tutored student was above 98% of the students in the control class" (ibidem)
Why Invest in Tutoring?
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