13) C

Let us use the bar for all ages which is about 18%.

Now remember, the graph is for x days or more.

If x = 3
The bar would be for 3 days or more.
Percentage should be = 10 + 6 + 4 + 3 + 11 = 34%
This is higher than 18%.

If x = 4
The bar would be for 4 days or more.
Percentage should be = 6 + 4 + 3 + 11 = 24%
This is higher than 18%.

If x = 5
The bar would be for 5 days or more.
Percentage should be = 4 + 3 + 11 = 18%
This is equal to 18% so this is correct.

If x = 6
The bar would be for 6 days or more.
Percentage should be = 3 + 11 = 14%
This lower than 18%.

So x = 5 and hence, C is correct.

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