Please use central limit theorem to solve this question with detailed steps, and indicate which formula you are using, thank you!(don't copy others' answers)

In an election between two candidates, A and B, one million individuals cast their vote. Among these, 2000 know candidate A from her election campaign and vote unanimously for her. The remaining 998000 voters are undecided and make their decision independently of each other by

flipping a fair coin. Approximate the probability pA that candidate A wins up to 3 significant figures.