Will optional Likert scale questions distort the average report score if a question is not answered?

Will optional Likert scale questions distort the average report score if a question is not answered?

I am doing a survey using many Likert scale questions, and would like to make the questions optional.  If people skip questions will it distort the average score for a question on the report?

Alternatively, is there a way to provide a "Dont' know" response on a Likert scale question?

Thanks

Dan

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