Mathematical odds of shark bites or being struck by lightening.

Your odds of being killed by a shark bite might be 1 in 3.7 million, but what does that mean, and how did they calculate it.

Is it the number of shark bites divided by how many people in the country?  Or, is it the number of shark bites divided by the number of people who visit the ocean?  Or, by the number of people who actually went into the water.

Popular statistics in the news are often misleading, or meaningless without knowing how the statistic was calculated.

The article below from the Wall Street Journal is a great introduction to the idea of conditional probability and statistics in general.  What is the probability of a shark bite, given you live in Denver with no oceans close by?

What Are the Odds_ Long, Most Likely – WSJ

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