<p>A teacher finds the distribution of scores on a final exam to be positively skewed with low variability. On the basis of this information, the teacher would be most justified in concluding that</p>
<p>(C) the exam was too difficult</p>
<p>I don’t see how low variability means exam difficulty. I would say the students are on the same level, or that they put the same effort into studying for the exam. Thus, they had similar grades. Is that wrong?</p>