Need help on this question....not sure if i really get the question... please help with the code and the approach. thx

python Write a function named "json average" that takes a JSON formatted string as a parameter in the format of an array of objects where each object has keys "mass", "density", "temperature", and "velocity" and each key maps toa floating point number. This function should return the average "mass" of all the objects in the array as a JSON string in the format ["mass: ) 1 import json 2 def json_average(x): counte sum-e Array json.loads(x) 4 6 for i in Array("density"): count +1 sum +arrayti] 9 return sum/count Submit for Practice error on input ['If"density: 556.84, "mass": 98.04, "temperature: -19.28, velocity": 58.37), f"density": 385.28, "mass": 1.16, "temperature": 9.24, "velocity 29.36), ["density": 237.16, "mass": 84.12, "temperature": -19.09, "velocity: 92.55), f"density": 872.85, "mass": 19.03, "temperature": 2.31, "velocity": 28.96)11: 'list