Question: The number of credit cards carried by students can be modelled using the Poisson distribution. A sample of students generated the following data

credits cards X 0 1 2 3 4 5 6

students with X credit cards 32 197 294 110 17 8 2

Find the sample size n, and hence the sample mean X. Use this information to calculate a 95% confidence interval for the average number of credit cards carried by students.