50% of babies are born female. Olive wants to find the probability that 20 or more of the 50 babies born today were female. If we use a double-sided coin and assign heads as females and tails

Afootball quarterback has two more chances to throw a touchdown before his team is forced to punt the ball. he misses the receiver on the first throw 25% of the time. when his first throw is incomplete, he misses the receiver on the second throw 15% of the time. what is the probability of not throwing the ball to a receiver on either throw?