6. In a survey, 12 people were asked how much they spent on their child's last birthday gift. The results appeared bell-shaped with a mean of $87 and a standard deviation of $4. a) (1 pt) Construct a confidence interval at a 95% confidence level. (You do not need to list definitions or assumption checks. Round solutions to the third decimal place.) b) (2 pts) State a real world interpretation of this interval.