Kata expects incorrect results. Sample tests ->

0.7521367521367521 should be close to 1.3641404805914972 with absolute or relative margin of 1e-06
0.6655462184873949 should be close to 1.471502590673575 with absolute or relative margin of 1e-06
0.7172413793103448 should be close to 1.534804753820034 with absolute or relative margin of 1e-06
0.7260504201680672 should be close to 1.431974921630094 with absolute or relative margin of 1e-06
0.7391304347826086 should be close to 1.4722564734895192 with absolute or relative margin of 1e-06

You need some warmup sample tests with 5 or 6 cards, so users can debug their solution easier.

replace tag average by statistics