Hi, I am currently outside and unable to work.
You can post the problem whenever you need. I will take a look at then when I am back home. Other mentors may also take your question. There are many other nice mentors here that can give you satisfactory answer.
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This is a very basic property that should be learned in first year calculus course.
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Check this.
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You have any other questions?
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This is now the updated file. I have used red fonts to indicate where I use the CLT (specifically, I used equation (17) in the notes you give me).
Feel free to ask if there is still confusion.
