Question 371790
Use the normal approximation for the binomial distribution with {{{mu = np = 2500*0.50 = 1250}}}, and {{{sigma^2 = npq = 625}}}, so that {{{sigma = 25}}}.  Then {{{P((H - 1250)/25<=(1200 - 1250)/25 = -2 ) = P(Z<=-2) = 0.0228}}}.