I have a formula question in a quiz.  The formula question gives the correct answer.  When students take the quiz, it show whether they got the correct answer.  The quiz appears to give them a point then they get the correct answer.

However, when I pull up quiz statistics, it shows all of the responses to formula questions as "ungraded."  (Below is what it looks like.)  Is there any way to get a frequency of correct vs incorrect?

Thanks.

Tom

Attempts: 15 out of 16

If the variance is 6.59, then the standard deviation is what?. (Enter your answer to two decimal places.)