Hyponatremia (low sodium levels) occurs in a certain proportion of marathon runners during a race. Suppose that

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Hyponatremia (low sodium levels) occurs in a certain proportion of marathon runners during a race. Suppose that historically, the proportion of runners who develop hyponatremia is 0.12. In a certain marathon, there are 200 runners participating.

(a) How many cases of hyponatremia are expected during the marathon?

(b) What is the probability of more than 30 cases of hyponatremia occurring?

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