Yes and no. Yes, in that the fee for a group session may be less than the fee for a one-on-one session; and no, because considerably more work can be accomplished during the same amount of time in a private session, making it likely to take fewer sessions for a student to achieve comparable proficiency or reach the established objectives of the tutoring, which can result in the final cost of individual tutoring being less than group tutoring.
Also, the additional time and attention a student receives from an instructor in one-one-one tutoring presents an opportunity to delve deeper into material, which can result in the student feeling more confident and prepared than he or she might otherwise experience in a group session for the same subject.