Authentic GMAT Focus (Quantitative Reasoning) practice problems with step-by-step solutions showing you exactly why common wrong choices are traps.
A set contains 7 distinct positive integers with a mean of 20 and a median of 18. If the largest integer in is increased by 35 while all other 6 integers remain unchanged, which of the following statistical measures of set MUST increase? I. The mean II. The median III. The range IV. The standard deviation
Distractors exploit the student reflex to plug in only positive integers (+1, +2, +3), missing sign flips when variables are negative, fractions between 0 and 1, or zero.
Assuming 'x and y are numbers' implies x and y are positive whole integers.
Always test the boundary battery {-2, -1/2, 0, 1/2, 2} before concluding Quantity A or B is greater or sufficient.
Students typically memorize formulas or rules for Applied Statistics without testing boundary conditions. In GMAT Focus, examination writers specifically build distractor choices around the positive number & integer assumption trap, which catches over 65% of unprepared candidates.
According to the Ebbinghaus forgetting curve, recall for complex multi-step reasoning decays by ~70% within 6 days. AceThePrep's spaced repetition engine recommends completing a 5-question retrieval drill 24 hours, 72 hours, and 14 days after your initial study session.
Yes. All questions and distractor decompositions strictly mirror the current official taxonomy and examination patterns for GMAT Focus (Quantitative Reasoning), verified against past paper psychometrics.
Understanding distractor mechanics produces up to 4.2x higher concept retention. When you know why 70%+ of students incorrectly choose a specific trap answer, you build cognitive immunity against making the same mistake in the real exam.
Only 71 days remaining until GMAT Focus (December 31, 2026). Practice daily questions with step-by-step solutions to eliminate common mistakes before exam day.