Normal distribution bounds

[mathmath98]

Can someone help me with this exercise?

 

[Deleted member 4993]

Can someone help me with this exercise?View attachment 27649

Please show us what you have tried and exactly where you are stuck.

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If you cannot even start, please tell us in english

definition of normal distribution as given in your text-book, and​

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the meaning of N(0,σ²)​