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10 cards from this deck
Experimental probability = successful outcomes / total trials
Experimental probability = 20/50 = 0.4 or 40%
68% chance of getting heads; coin may be biased.
Each side should come up 25 times (100/4).
Compare observed frequency to expected frequency.
Significant difference from expected outcomes.
They reduce chance errors and improve accuracy.
Use control groups to compare results objectively.
Show your working and substitute numbers clearly.
It may suggest bias in the experiment.
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