Classify each of the following as N, nominal; O, ordinal; or I/R, interval/ratio data: zip code of your local address; amount of money in your wallet; your rank in this subject; mileage of your motorbike?
1) N; I/R; O; I/R
2) O; I/R; I/R; N
3) None of the above
4) O; I/R; N; I/R