4. If a coin, it is tossed 40 times and we denote X as a random variable- number of heads. Which of the following is true? (it can multiple choice) a) X has a binomial distribution with n=40 and p=0.5 b) X will almos certaintly equal 20 because H=np=20 e) P(x>25)= d) The parameter n is large enough for the normal approximation e) P (X>25) is approximately the same as the probability a standard normal random variable is greater than z=25.5

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