Statistics for Spot the Imposter - U.S. Federal Holidays

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Question	Answer	% Correct
Which is not an officially-recognized U.S. Federal holiday?	Boxing Day	99%
Which is not an officially-recognized U.S. Federal holiday?	Flag Day	98%
Which is not an officially-recognized U.S. Federal holiday?	September 11th	97%
Which is not an officially-recognized U.S. Federal holiday?	Mother's Day	96%
Which is not an officially-recognized U.S. Federal holiday?	May Day	95%
Which is not an officially-recognized U.S. Federal holiday?	Patriots' Day	94%
Which is not an officially-recognized U.S. Federal holiday?	Indigenous Peoples Day	89%
Which is not an officially-recognized U.S. Federal holiday?	Election Day	85%
Which is not an officially-recognized U.S. Federal holiday?	New Year's Eve	84%
Which is not an officially-recognized U.S. Federal holiday?	Constitution Day	79%
Which is not an officially-recognized U.S. Federal holiday?	Easter	69%