can You please do this exercise for me? I could not do it and I would really appreciate it:

context:

It has been established that the results of a barrier test used to select the candidate(s) applying for admission to a private institution follow a normal law of expectation 500 and standard deviation 50.

Questions: And now What are the chances out of 100 that a candidate will obtain a score higher than 550?

So 60% of candidates who take this selective test will have a result higher than what value?

A candidate who has taken the test thinks they are in the top 5%. If this is correct, what is the minimum result he must have obtained?

One of the standards of the head of the establishment's orientation service is to recommend refusal if the result is less than 400. How many candidates will be refused if 800 have taken the test?