Two follow-up questions. What are the numbers out to the right of some of the equations? They look like a -1 and a -2 with a circle around them. The second question, and probably the most important...Why do we multiply equation 1  by 9?

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Q: Just ignore the top top one please.

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A: •The correct option is :-(B). it increases by a factor of two.

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A: Since you have posted multiple questions, we are entitled to answer the first only.

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A: No health insurance probability = 20%    Random sample strength, n     = 15