please help, just need number of probability

(C) Your friend is doing a research project reviewing NFL footage to see if there is any evidence that referees are not using fair coins (i.e., slightly biased toward heads, prob=.53) in the coin toss. To help your friend, run the heads simulation increasing the number of flips in increments of 25. Based on your findings, advise your friend on how many NFL coin tosses they should review and how confident they can be that the results of the coin toss differ from the expected probability of .50