In a national survey college students were asked "how often do you wear a seatbelt when riding in a car driven by someone else? " the response frequencies are as follows: never is 122 ; rarely is 322 ; sometimes is 597 ; most of the time is 1157 ; always is 2309. a) construct a probability model for seat-belt use by a passenger. b) would it be considered unusual to find a college student who never wears a seat belt when riding in a car driven by someone else?