If there is a 1/2 probability of having a green seed and a 1/4 probability of having

The probability of having a green seed and a round seed is 1/8th

Assuming the question is "how much more money needs to be raised..."

Add the contributions:

5,358 + 2,834 + 4,132 = 12,324 < this is the current total amount raised. subtract this from the goal, 14,000 to find out much more money is needed for the playground.

14,000 - 12,324 = 1,676

 $1,676  is still needed in order to create the playground.