Answer:
There is 0.6 chance that Joe a blue marble provided that he has already chosen a red marble
Explanation:
Given
---- first
---- second

Required
Explain what it means
The options are not given. So, I will answer on a general terms.
is the event that B occurs given that A occurs
Using the terms in this question;
there is 0.6 chance that Joe a blue marble provided that he has already chosen a red marble