Who are you: Student
Sally plans to bet 100 bets of $1.00 each on red roulette. the probability of the ball landing on red is 18/38 what is the probability that Sally will win at least half the time
The outcomes of the spins of a roulette wheel are independent so this is a bonomial process. The probability of success (the ball landing on red) is p = 18/38 and the number of trials is n = 100. If X is the number of successes then you want to find
Pr(X ≥ 50). I think that you are expected to use the normal approximation to the binomial.