As per given graph in the question,
Highest run scored by C = 52
Total run scored by C = 414
Number of match played by C if matches having zero runs and the one with highest runs is ignored = 20 - 1 - 2 = 17
Total runs scored by C if matches having zero runs and the one with highest runs is ignored = 414 - 0 - 52 = 362
Average runs of C = 362 / 17 = 21.29
