Practice — Statistics and Probability

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CBSE 9 Math
U6
Item 13

Multiple choice·Hard exam skill (4/5)·No calculator

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

A student's solution in Mean and Weighted Average is wrong because it takes an ordinary mean even when weights are unequal. Which correction is best?

Choose an answer

A.Do not write a reason because the answer is visually obvious.

B.Return to the condition, then redo the calculation or proof.

C.Keep the same steps and change only the final answer.

D.Use a longer formula even when the required condition is simpler.

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