please explain clearly.

4. A question on the General Social Survey was this: "How many family members do you know that are in prison?" The results of 499 respondents indicate that the mean number of family members in jail is 1.22, with a standard deviation of 0.59. (a) What shape would you expect the distribution of this variable to have? Why? (b) Construct and interpret a 99% confidence interval for the mean number of family members in jail