There is a way to reduce the variance, instead of evaluating at the end i.e 
    print((pcq/prq).evalf()) evaluate the random points in the beginning 
itself

p = c1.random_point().evalf() 
q = c1.random_point().evalf() 
r = c1.random_point().evalf() 
Using the above method i get the values with a variance of 0.01 (1.99-2.01)

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