average life expectancy Age at death has a bimodal distribution: a huge portion of humans die at or near birth. If you survive that you're pretty likely to liv

average life expectancy Age at death has a bimodal distribution: a huge portion of humans die at or near birth. If you survive that you're pretty likely to live quite a while, living well past the mean. That's 'cause all the deaths at infancy bring down the mean quite a bit.