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1st column is age group

Dx is the number of deaths

Px is the population at that particular age interval at risk

Mx is mortality rate

Qx is the probability of dying in that age group

SEQ is stn error of Qx

lX hypothetical pop of 1000 people being born at that time who then died, number of survivors

and you start off with 1000

so life expectancy at birth is 44 with stn error of 1.7

ex is life expectancy at age interval

SE is the amount of error at above point (ex)