Answer:
2/13 and 1/5
Step-by-step explanation:
This is a probability problem
Let us list the sample space
6 medium,
10 large, and
10 extra-large shirts.
The sample size is 6+10+10=26
1.The probability of a player picking a medium size for himself is
6/26=2/13
2.The probability of a player picking a medium size for his sister is
Note this is done without replacement of the first even above hence the sample size has reduced to 25
And the medium size has also reduced to 5
5/25=1/5