Thread: What would make Kobo surpass Kindle?
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Old 12-02-2017, 05:31 PM   #222
sjfan
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Quote:
Originally Posted by Tony1988 View Post
Correct. It's not an exact. Average is the median.
Average can be many things (mean, mode, median, geometric average, etc), but most commonly when used without qualifier it is the mean. For life expectancy it's generally the mean, and the distribution is not normal so the mean and median are different.

It's definitely worth noting that life expectancy at birth differs from life expectancy for an adult, because there are a disproportionate number of childhood deaths; that's not as huge a factor as it was 100 years ago, but it still has an impact.

US life expectancy at birth is about 78 years, but a 30 year old on average will live to 82 years and a 60 year old can expect to live to about 85. That's partially eliminating childhood diseases and partially that you've avoided getting whacked by a car or similar for 30 years already so you've eliminated low-end risk.
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