# Why does a constant force of mortality imply deaths occur on average halfway through the rate interval?

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asked Apr 13, 2016

When calculating the age to which the estimate of the force of mortality applies we assume the force of mortality is constant over the rate interval. Why does this assumption imply that deaths occur on average halfway through the rate interval?

commented Apr 14, 2016 by (330 points)

I don't see how a constant force of mortality assumption will imply that deaths will occur on average halfway through the rate interval. The UDD assumption over a rate interval implies that deaths occur on average halfway through the rate interval.