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The latest poll for Obama v. Romney in Presidential Election 2012 shows that 47% will vote...

The latest poll for Obama v. Romney in Presidential Election 2012 shows that 47% will vote for Obama and 43% will vote for Romney, while the rest are still undecided.

a. Of 50 voters, find the expected number of votes for Obama.

b. Of 50 people, find the standard deviation of the number of votes for Romney.

c. Find the probability that, of 15 votes, at least 7 of them will be for Obama.

d. Find the probability that any of those 15 voters is still undecided.

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