Item difficulty index can be found by dividing the number of the test takers correctly answering each item by .........
The total number taking the test
In item analysis, the difficulty index (p) of an item is the proportion of examinees who answer it correctly: \(p = \dfrac{\text{number answering the item correctly}}{\text{total number taking the test}}\).
A high p (close to 1) means an easy item and a low p means a difficult item. Dividing by the number of girls, boys or questions would not give this proportion.
Hence, the answer is The total number taking the test.
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