25 independent polls of 1000 random people each are taken during the course of an extremely close election campaign. People in the poll are asked which of the two candidates they favor.

A. Estimate the standard error and margin of error for each of the polls

B. How large a poll sample would be required if a margin of error of only 10% was desired

C. One of the other candidates approval ratings averaged around 48% over all of the 25 polls. If you computed the standard deviation of the list of all 25 poll percentages for this candidate, approximately what number would you expect to get?