The probability of selecting kickball and hiking is 1/24, or approximately 0.0417 or 4.17%.
The probability of selecting kickball and hiking is equal to the probability of selecting kickball multiplied by the probability of selecting hiking, since the events are independent.
In Session 1, there are 6 activity choices, including kickball. So the probability of selecting kickball in Session 1 is 1/6.
In Session 4, there are 4 activity choices, including hiking. So the probability of selecting hiking in Session 4 is 1/4.
Therefore, the probability of selecting kickball and hiking is (1/6) * (1/4) = 1/24, or approximately 0.0417 or 4.17%.