If 8 out of 10 students in the upper group and 2 out of 10 students in the lower group answer an item correctly, then the difficulty and discriminating power of the item would be
A)50%, .60.
B)50%, .80.
C)60%, .60.
D)60%, .80.

Question

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The Answer of If 8 out of 10 students in the upper group and 2 out of 10 students in the lower group answer an item correctly, then the difficulty and discriminating power of the item would be
A)50%, .60.
B)50%, .80.
C)60%, .60.
D)60%, .80.

If 8 Out of 10 Students in the Upper Group