Judging by your graph, it should be 30 :)
Answer:
YA I KNEW IT UUUUUUUUUUUUUU
1.573173141822894. I think this is the answer but not 100% sure. Good luck!
False it could only occur 1/4 since there is only 4 colors
About 4:39.
Hope this helps~!
~{Isle of flightless birds}