At a recent concert the attendance was recorded to be 36327. A random sample of 2254 of those in attendance found that the mean quantity of memorabilia purchased per person was 1.23 with a standard deviation of 0.50. Develop an approximate 99-percent confidence interval estimate for the mean number of memorabilia purchased per person.
For full marks your answer should be accurate to at least three decimal places.
Confidence interval: (0 , 0)