The answer is A
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ANSWER
The number of children between the ages of 9 and 15 who visited the park is

EXPLANATION
The number of children between the ages of 9 and 15 who visited the park are those within the age group 9 to 12 and 12 to 15.
We can from the graph that, the height of the bar that corresponds to the age group 9 to 12

and the height of the bar that corresponds to the age group 12 to 15

The sum of the two frequencies
We need to count the number of games that score 15, 16, 17 and 18
Score 15 = 3 games
Score 16 = 2 games
Score 17 = 5 games
Score 18 = 3 games
Total = 13 games
5 (x+4) ...................