The sofas I’m shopping for have prices that are well approximated by a normal distribution with mean ? = $850 and standard deviation ? = $120. With this information, what is the probability a. that I find a sofa that meets my goal of costing no more than $400. b. that I find a sofa that I can pay for with my extra money earned this summer from babysitting at $825. c. someone shows me a really nice sofa that costs as much as my first car: $1200.

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