Answer:
Nine chances out of ten, it's wrong means that 90% of the time, the place the person is, or wants to go is a wrong judgment that only has 10% chance of being a good option. This means that the probability of been wrong is 9/10 which is very high.
Mr Buckingham is trying to tell them to be somewhere else that 90% more probable of being a good option so as to maximize their decision making.
An example of a career is that of a geologist. It involves studying the earth in all its manifestations right from the study of the 3 main rock types, of ore deposits, of oil and gas deposits, of fossils and minerals, of the earth's structure, its' landforms, etc. The types of work it involves are such as mineral exploration geologist, mine geologist, geotechnical engineer, paleontologist, petroleum geologist, structural geologist to name some of the types of work.