Fill in missing information to make the equality true: (... +2a)2 = … +12ab2+4a2.
2 answers:
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I believe you do
The number of people who voted follows a binomial distribution with probability of having voted 
and 
subjects, which means the approximating normal distribution should have mean 
and standard deviation 
.
With the continuity correction, you have
With the continuity correction, you have