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The Kuder-Richardson formula (21) as a split-half coefficient, and some remarks on its basic assumption

I need to estimate the internal consistency reliability of a fifty-item multiple choice test that has a mean of 38.75 and a variance of 50.30 ....i just cant seem to find the KR21 formula. I know what the KR20 formula is but i cant find kr21.

Kuder Richardson Formula 21 >> Going the Distance: Kuder-Richardson Formula 21

Kuder Richardson Formula 21 >> Going the Distance: Kuder-Richardson Formula 21

Kuder Richardson Formula 21 >> Part 2: Reliability & Validity - ppt download

Kuder Richardson Formula 21 >> Part 2: Reliability & Validity - ppt download