the question is below

1. [How Long Living In Town?] [10 points] A recent General Social Survey has asked subjects, "how long have you lived in the city, town, or community where you live now? The responses of 1415 subjects in one survey had a median of 16 years, a mean of 20.3 and a standard deviation of 18.2. (a) (4pts) Construct a 95% confidence interval for the population mean length of time that people have lived in the city, town, or community where they live now. (b) (3pts) Do you think that the population distribution is normal? Why or why not? (c) (3pts) Interpret the confidence in part (a). Specifically, explain what is the thing that has a 95% probability to happen