Statistical use of the normal distribution problems

[Paulo2014]

Hello
This attachment is a practice paper I am doing. I know how to do everything except for questions 11, 12 and 13 so I would appreciate it if someone could please show me the process for working them out. thanks in advance.

 

[Paulo2014]

anyone?

 

[arunbg]

It is quite a lengthy document. Perhaps you can show some of your thoughts, and post your doubts in a more concise manner?

 

[dynamicsolo]

Those three problems are related to the statistical use of the normal distribution. Have you had that material already?

 

[Paulo2014]

Yes I have read the material. The answer I just got for question 13 was 429 grams. Is that correct?

 

[konthelion]

Where's your work? All I see are answers.