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There are currently seven billion people alive today and the Population Reference Bureau estimates that about 107 billion people have ever lived. This means that we are nowhere near close to having more alive than dead. In fact, there are 15 dead people for every person living.
Estimates of the total number of humans who have ever lived range in the order of 100 billion. Estimates of this kind cannot hope to give more than the rough order of magnitude, as even modern population estimates are fraught with uncertainties of the order of 3% to 5%.