If a quiz is muted, on the student's end, will they see the comments that are added to along with their grade while muted?
Hi, submission comments are not visible when you mute an assignment. You can read more here How do I mute or unmute an assignment in SpeedGrader? and you will see more information as well in the popup when you click the mute button in the assignment.
There's currently one type of comment which is not held back by Mute Assignment and not clearly documented currently. Peer Review comments by reviewers of a student's submission are available to that student immediately, regardless of Mute.
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