What is the average life expectancy in African countries that are republics?
SELECT avg(LifeExpectancy) FROM country WHERE Continent  =  "Africa" AND GovernmentForm  =  "Republic"
SELECT avg(LifeExpectancy) FROM country WHERE Continent  =  "Africa" AND GovernmentForm  =  "Republic"
[{'avg(LifeExpectancy)': 50.84347826086956}]