Let x represent the dollar amount spent on supermarket impulse buying in a 10-minute (unplanned) shopping interval. Based on a newspaper article, the mean of the x distribution is about $46 and the estimated standard deviation is about $9. (a) What is the probability that x is between $43 and $49? (Round your answer to four decimal places.)   (b) Let us assume that x has a distribution that is approximately normal. What is the probability that x is between $43 and $49? (Round your answer to four decimal places.)

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