An item is answered correctly by 18 out of 60 students. Using the stated difficulty formula, the item’s difficulty percentage is:

A. 20%
B. 30%
C. 40%
D. 70%
Correct Answer: B. 30%

Difficulty percentage = (correct responses / total students) Γ— 100 = 18/60 Γ— 100 = 30%.

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