Question 629648
Assuming P(girl) = 1/2, note that the binomial distribution is symmetric. This means that


*[tex \LARGE P(x \ge 8) = P(x \le 7)]


The sum of *[tex \LARGE P(x \ge 8)] and *[tex \LARGE P(x \le 7)] is 1, so *[tex \LARGE P(x \ge 8) = \frac{1}{2}].