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The theoretical probability of getting three heads when tossing three coins simultaneously is 1/8, as there are 8 possible outcomes (HHH, HHT, HTH, THH, HTT, THT, TTH, TTT) and only one of them results in three heads.
The experimental probability of getting three heads in this experiment is 40/100 = 2/5.
The difference between the experimental probability and the theoretical probability is:
2/5 - 1/8 = 16/40 - 5/40 = 11/40
Therefore, the difference between the experimental probability of getting three heads and its theoretical probability is 11/40.