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Hi! I was taking a test and got these wrong. I see the correct answer and I don't know how to get it. Please help

Hi! I was taking a test and got these wrong. I see the correct answer and I don't know how to get it. Please help me understand the steps and how to work out these problems.

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X In a certain community, 22% of 0/2 households have 1 child, 33% of households have 2 children, and 45% of households have 3 children. What is the expected number (value) of children in that household? HINT: A probability table may be helpful. * 3 Children X IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII Correct answer 2-23

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