A difficulty value of less than 0.20 means:

The difficulty index in item analysis measures the proportion of test-takers who answered an item correctly. A difficulty value of less than 0.20 (or 20%) indicates that very few students answered the item correctly, making the item too difficult for the test-takers. Ideally, items should have a difficulty index between 0.30 and 0.70 for a well-balanced test.

• Item is too easy (A) would correspond to a difficulty value closer to 1.00.
• Item is acceptable (B) typically falls within the 0.30-0.70 range.
• Item is weak (D) relates more to discrimination or other item analysis metrics, not solely difficulty.