Britney doesn't normally wear green as she doesn't feel it complements her skin tonenormally, she'll wear green only once every 20 times she goes out. The only exception is St. Patrick's Day. If it's St. Patrick's, then 9 times out of 10, Britney will be wearing green. One day, Justin is walking on the street when he sees Britney wearing green. Knowing Britney, he wonders whether it's St. Patrick's Day. What's the strength factor of Justin's evidence? If your answer is not an integer, write it as a decimal. You should not need to round it. Hypothesis: today is St. Patrick's Day. Evidence: Britney is wearing green.

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