If we define a random variable to have two possible outcomes, March runoff 4 in. or above and March runoff less than 4 in., use the data of Table 2.13 to estimate the probability of the event that March runoff is 4 in. or greater. Find the following probabilities: (a) In the next 5 years, at least 3 of the years will have a March runoff that is 4 in. or greater; (b) exactly 2 of the next 10 years will have a March runoff of 4 in. or more; (c) in the next 6 years, no March runoff will be 4 in. or more; and (d) in the next 8 years, the runoff in March for at least 6 of the years will be less than 4 in.
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