it was either a blue or a green car.
It is green if the witness made a mistake.
The probabilty for that is .15*.2 (probabilty of the car being green times the probability that the suspect was wrong).
Therefore the chance for a blue car is 1-.15*.2=.97

## Negative solution

it was either a blue or a green car.

It is green if the witness made a mistake.

The probabilty for that is .15*.2 (probabilty of the car being green times the probability that the suspect was wrong).

Therefore the chance for a blue car is 1-.15*.2=.97