For a certain river, suppose the drought length Y is the number of consecutive time intervals in which the water supply remains below a critical value y₀ (a deficit), preceded by and followed by periods in which the supply exceeds this critical value (a surplus). An article proposes a geometric distribution with p = 0.386 for this random variable. (Round your answers to three decimal places.) (a) What is the probability that a drought lasts exactly 3 intervals? At most 3 intervals?

exactly 3 intervals
at most 3 intervals