Can a bimodal distribution have a gap? 
The question asks to describe the distribution of aspen tree diameters from the sample. 
I said that the distribution was bimodal with one peak around 5.2 and the other peak around 9.2. 
However the correct answer is that the distribution is skewed to the right and has a gap between 7 and 8 inches. 
I tried looking online for some answers but I can't find any. Why is this a skewed unimodal distribution instead of a bimodal distribution? Is it because in a bimodal distribution there are two peaks but there is no gap, instead it is just a very low frequency between the two peaks?

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*Can a bimodal distribution has a gap. 


Yes, it is possible to have $0$ probability in between. 
For example, consider the following discrete random variable. 
$$P(X=1)=0.1, P(X=2)=0.3, P(X=3)=0.1$$
$$P(X=8)=0.1, P(X=9)=0.3, P(X=10)=0.1$$
It is bimodal and it can't take value from $4$ to $7$.
Your distribution is skewed to the right as there are more points on the left.
Your distribution is skewed to the right, bimodal, and has a gap.
