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Which one of the following is correct formula suggested by H.A. Sturges for determining the size of class interval for analyzing data ?

[A] i = R / (1 + 2.3 log N)

[B] i = R / (1 + 3.3 log N)

[C] i = R / (1 + 4.3 log N)

[D] i = R / (1 + 3.3 × N)

Answer & Explanation
Answer: i = R / (1 + 3.3 log N)