Dear Nabhayna,

 Please consult

https://sites.math.rutgers.edu/~zeilberg/Hist21/q5S.pdf

for the full solutions.

You got 7 points (out of 10).

#In #4(ii) you got the wrong a and b and did not explain how you got N=29. I gave you 1 token point

4(ii) would have been right, so I gave you a point for this

 Best wishes,

   Dr. Z.