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Your answers to #8 are incorrect.
Since this is homework, I am loathe to just tell you the correct answer on a factual question. But you didn't explain why you gave the answer you did for part 1.
So if you explain, I can perhaps point you into the right direction (and being shown where you went wrong will be more helpful than just being told the right answer).
For part 2, the key thing to note about your answer is that ultimately you explained that it is possible for someone to score 50 points. That is irrefutably true (it is possible for someone to have had every even numbered score between zero and 100). But that wasn't the question, the question asks whether you expect someone to score that low.
So, since you've been told that the results followed a normal distribution, the first question you need to ask yourself is this: How many standard deviations is 50 from 80?
Then using what you know about how standard deviation correlates to percentage of results, reconsider the question asked.
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