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The theoretical probability of getting three heads when tossing three coins simultaneously is calculated as (1/2) * (1/2) * (1/2) = 1/8.
The experimental probability of getting three heads from the given data 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.