The histogram shows information about the birth weights of some babies. 6 of these babies had a birth weight less than $$\(2.5 \mathrm{~kg}\)$$ or greater than $$\(4 \mathrm{~kg}\)$$. Work out the number of babies who had a birth weight between $$\(2.5 \mathrm{~kg}\)$$ and $$\(4 \mathrm{~kg}\)$$.

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