Bob says he is 50 percent sure he could swim across the Thames River.

(a)What kind of probability is this?EmpiricalSubjectiveClassical

(b)On what facts might Bob have based his assertion?(You may select more than one answer. Click the box with a check mark for the correct answer and double click to empty the box for the wrong answer.)

He dreamed of swimming across the Thames River from his childhood.He based his assertion on the success of others who have completed this feat.He consulted an astrologer who told him that he would swim across the Thames River.He is confident on his swimming ability.