<image>To understand the relevant information about the fish being bred in a small reservoir, 100 fish were caught from various locations within the reservoir. The weight of each fish (in kg) was recorded, and the data was grouped to create a frequency distribution histogram (as shown in the figure): 

(1) Fill in the corresponding frequency in the table below;
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(2) Estimate the percentage probability of the data falling within the range [1.15, 1.30].

(3) After marking the 100 caught fish and releasing them back into the reservoir, thoroughly mix the fish, and then catch 120 fish from various locations within the reservoir again. Among these, 6 fish have the mark. Based on this information, estimate the total number of fish in the reservoir.