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Statistics Practice Questions - Page 3

Questions 21–30 of 33 · Page 3 of 4

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Questions
33
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Q21Find the mean deviation about the mean for 8,10,12,14,16.ModerateSolve →Q22For data 2,2,3,3,3,4,4,5,6 find Karl Pearson’s coefficient of skewness using mode.DifficultSolve →Q23Compute the Pearson correlation coefficient r for pairs (1,2),(2,4),(3,5),(4,4),(5,5).DifficultSolve →Q24Given a discrete distribution X with values 0,1,2,3 having probabilities 0.1,0.3,0.4,0.2, find E[X].ModerateSolve →Q25Find the geometric mean of 4 and 16.EasySolve →Q26Find the harmonic mean of 2, 4, and 8.ModerateSolve →Q27For data 12,14,16,18,20,22,24,26,28 compute Bowley’s coefficient of skewness.DifficultSolve →Q28Find the mean for grouped data with classes 0–10,10–20,20–30,30–40 and frequencies 5,9,7,4 (use class midpoints).ModerateSolve →Q29Find the 90th percentile (P₉₀) for grouped data with classes 0–20,20–40,40–60,60–80 and frequencies 8,12,15,5.DifficultSolve →Q30Two distributions have (mean, SD) = (40,6) and (50,7.5). Find the ratio of their coefficients of variation (CV₁/CV₂).PYQSolve →
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