2/5 ( 1/3 x− 15/8 )− 1/3 ( 1/2 − 2/3 x)
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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