fnMedianValue function
MedianValue(values): median
Implementation
dynamic fnMedianValue(List<dynamic> values) {
if (values.isEmpty) return 0.0;
final nums = values.map(varToDouble).toList()..sort();
final n = nums.length;
if (n.isOdd) return nums[n ~/ 2];
return (nums[n ~/ 2 - 1] + nums[n ~/ 2]) / 2;
}