Jemma has 24 balls. out of the 24 balls, 12 are yellow, 4 are pink, and the rest are red. what is the ratio of the number of red balls to the number of balls that are either yellow or pink?

The weekly amount spent by a company for travel has an approximately normal distribution with mean = $550 and standard deviation = $40. a) what is the probability that the actual weekly expense will exceed $570 for more than 20 weeks during the next year? (note: one year = 52 weeks) b) what is the probability that actual weekly expenses exceed $580 for 10 or more, but 16 or fewer weeks during the next year?