The probability that a randomly selected attendee has been to England, if it is known that they have been to Germany is 3/20.
Event e : the attendee has been to Germany
Event g : the attendee has been to both, England as well as Germany
Let the total number of attendees in a conference is = x
Hence, % of attendees been to Germany = 75% = 0.75x
And, % of attendees been to both England as well as Germany = 15% = 0.15x
The probability of selecting a random attendee who has been to England and Germany is:
P = 0.15x/x = 0.15/1 = 15/100 = 3/20
Hence, the probability that a randomly selected attendee is 3/20.
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