S1 CHAPTER 9 HELP - Normal Distribution

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Student_17362929
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I'm struggling to get through the exercises in s1 since I don't understand the logic behind them, solution bank doesn't explain how the answers have been obtained clearly enough either.

I don't understand exercise 9b) question 4c, question 5a. I would really appreciate if someone could explain how to work these out as I could then apply this to questions of a similar type. Thank you Attachment 729144
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the bear
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if you could post the questions you would get more answers; we do not all have the textbook in front of us.
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Student_17362929
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(Original post by the bear)
if you could post the questions you would get more answers; we do not all have the textbook in front of us.
Hi I've just attached it to the post
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the bear
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(Original post by Student_17362929)
Hi I've just attached it to the post
it's good.

so for 4 c) notice that there is a symmetric interval. the probability that Z is between 0 and a is half of 0.5820

so the probability that Z < a is half of 0.5820 plus 0.5
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