(b) p(2 correct answers|indian)*p(indian) + p(2 correct answers|tourist)*p(tourist)
0*1/3 + 0.75^2 = 9/16
use the same method as (b)
use the same method as (c)
This person has given different replies, so must be a tourist. what is the probability of a tourist giving 3 correct answers out of 4?
should follow from (d) and (e).