Chapter 8 Confidence Intervals (Mean) Progress saved Done Score: 0/14 0/14 answered Question 6 0/1 pt 9 In a survey, 28 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $34.7 and standard deviation of $17.8. Estimate how much a typical parent would spend on their child's birthday gift (use a 80% confidence level). Give your answers to 3 decimal places. Express your answer in the format of _ _ Error. F Submit