📐Chapter Practice
Statistics & Mathematical Reasoning — JEE Practice
14 practice questions across 1 topics. Filter by difficulty, solve topic-wise MCQs, and review detailed solutions.
1 Topics14 Questions
Mean, Variance & Standard Deviation(14 Qs)
easy (5)
medium (5)
Q1If the mean of n observations is x̄ and each observation is increased by k, the new mean is:Q2If each observation is multiplied by k, the new variance is:Q3The mean deviation about the mean for data 4, 7, 8, 9, 10, 12, 13, 17 is:Q4Coefficient of variation (CV) is:Q5The variance of the first n natural numbers is:
hard (4)
Q1If two groups have n₁, n₂ observations with means x̄₁, x̄₂ and variances σ₁², σ₂², the combined variance is:Q2If the variance of x₁, x₂, ..., xₙ is σ², the variance of ax₁+b, ax₂+b, ..., axₙ+b is:Q3For a frequency distribution, if Σfᵢ = 30, Σfᵢxᵢ = 120, Σfᵢxᵢ² = 600, then variance is:Q4The statement "If p then q" is logically equivalent to:
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