Please help me solve this question, thank-you!

Suzie tosses a 2- sided fair coin 75 times. a) Show that the normal approximation can be used for this binomial distribution. b) Estimate the probability that she will toss tails between 40 and 45 times. c) Estimate the probability that she tosses exactly 35 tails. d) Explain whether this variable is discrete or continuous. e) Explain the interval that you chose to test in b)