Probability question

I want to ask for a detailed answer for this probability question. 

  • Your bounty seems a bit low for a multiple-part question.

Answer

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  • Hi, I want to ask for (v), what happens if the student doesn't answer in some question? Will the number of wrong questions be 24-X anymore?

  • No, you would need to know how many questions they left blank to know how many questions they answered incorrectly

  • Oh okay

The answer is accepted.