In a survey, 223 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $43.67 and standard deviation of $15.06. Estimate how much a typical parent would spend on their child's birthday gift (use a z-interval at a 90% confidence level). Give your answers to 2 decimal places. Express your answer in the format of E. $ ± $

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