Mathematics · Statistics and Probability
Using Kuder-Richardson Formula 21 (KR-21), what is the reliability of a test consisting of 50 items with a mean score of 30 and a standard deviation of 6?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 10.68✓
- 20.78
- 30.69
- 40.86
Correct answer
0.68
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