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X, the length of hospital stay for patients of a certain procedure ranges from 1 to 4 days. The probability distribution is in the

X, the length of hospital stay for patients of a certain procedure ranges from 1 to 4 days. The probability distribution is in the accompanying table. No. of days 1 2 3 4 Probability 0.1 0.2 0.4 0.3 a. Calculate the probability that a patient will stay less than three days. [2 marks]

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