What I did, but not total sure it is right was I divided 325 by 500 to get .65. I took the square root of .67(1-.67) which would give me the st. dev. Finally I subtracted .65-.67 and divided it by the st. dev. I used that number which gave me the z score and found what the zscore was equal to. Then I subtracted that number from 1. Does this sound correct?

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