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The life span of U.S. currency is determined by usage. Paper currency of $20, $10, $5, $1 on average stays in circulation less than two years, while a $50 or $100 bill has an average life span of more than seven years.
The average lifespan of the average African-American male is 69 years.
The span error is calculated by taking the span error and dividing it by the original measurement then multiplying by 100. The value gives us the span error as a percentage.
Span
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