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For the step-deviation method, uᵢ is defined as:
A(xᵢ + a) / h
Bxᵢ · h
Cxᵢ − a
D(xᵢ − a) / h
Answer & Solution
Correct answer: D. (xᵢ − a) / h
uᵢ = (xᵢ − a) / h, where a is the assumed mean and h is the common class width. The mean is then a + h · (Σfᵢ·uᵢ)/Σfᵢ.
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