Question 1187840
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In this response, I will answer questions (a) and (b), ONLY.



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Go to online  (free of charge)  normal distribution probability calculator 
https://onlinestatbook.com/2/calculators/normal_dist.html



Input the given parameters of each part into the appropriate window of the calculator and get the answers

to your questions.



The calculator has perfect description and design,  so  EVERY  person,  even beginner,  may work with it on his or her own,

even having minimum knowledge on the subject.



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Or, alternatively, you may use your  GRAPHING  CALCULATOR. 
See  THIS  Internet source / site



https://mathbits.com/MathBits/TISection/Statistics2/normaldistribution.htm



Find there  EVERYTHING  you need to know in clear and compact form

to solve this problem  (and thousand other)  similar and different problems  ON  YOUR  OWN.



Happy calculations  ( ! )



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Your questions  (c)  and  (d)  are  TWO  OTHER  separate problems.


In the future, PLEASE, never pack more than one problem per post.



<H3>One and ONLY ONE problem/question per post.</H3>


It is the RULE, &nbsp;the &nbsp;POLICY &nbsp;and the &nbsp;REQUIREMENT &nbsp;of this forum.


It is written in this page


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It is assumed that you read these rules before posting.


It is also assumed that you do understand what is written in that page and follow the rules.



Those who violate them, &nbsp;work against their own interests.



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