Further MathematicsStatisticsWAEC
Find the standard deviation of 2, 4, 4, 4, 5, 5, 7, 9.
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Answer: D. 2
Mean = 5; squared deviations total 9 + 1 + 1 + 1 + 0 + 0 + 4 + 16 = 32; variance = 32/8 = 4; s.d. = 2.
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