In a survey, 20 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $47.8 and standard deviation of $18.8. Estimate how much...

In a survey, 20 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $47.8 and standard deviation of $18.8. Estimate how much a typical parent would spend on their child's birthday gift (use a 99% confidence level). Give your answers to 3 decimal places.


Express your answer in the format of ¯x ±  E.
$?   ±
$
?