Question: how to solve Question 19 Keep using the following info for this question and the next one question: Three machines are available to cut concrete

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Question 19 Keep using the following info for this question and the next one question: Three machines are available to cut concrete blocks. Each machine needs to be brought down from time to time for maintenance. At any given moment, the probability that a machine is down is 0.1, and the probability that it is functioning is 0.9. Assume the machines function independently. Let x be the number of machines that are functioning. Find the probability mass function of x = 2, i.e. p(x = 2), [answer should be in decimal form, rounded to 3 decimal places]

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