A. To calculate the probability of randomly selecting a person who will vote for Candidate 1 or 2, we need to add the number of supporters for Candidate 1 and Candidate 2 and divide it by the total number of voters surveyed.
Total number of supporters for Candidate 1 and Candidate 2 = 250 + 1250 = 1500
Total number of voters surveyed = 2500
Probability = (1500 / 2500) = 0.6 or 60%
Therefore, the probability of randomly selecting a person who will vote for Candidate 1 or 2 is 60%.
B. If 1,000 more voters are surveyed, we can assume that the same proportion of voters preferring Candidate 3 and 4 will remain the same. We can calculate this by finding the ratio of supporters for Candidate 3 and 4 in the initial survey and applying it to the additional 1,000 voters.
Ratio of supporters for Candidate 3 and Candidate 4 = 450 : 550 = 9 : 11
Adding 1,000 more voters:
Total number of voters = 2500 + 1000 = 3500
Number of voters preferring Candidate 3 = (9/20) * 1000 = 450
Number of voters preferring Candidate 4 = (11/20) * 1000 = 550
Therefore, out of the additional 1,000 voters surveyed, approximately 450 will prefer Candidate 3 and 550 will prefer Candidate 4 based on the initial ratio.