Math problem (Statistics)

[Amy Bloom]

Hola friends!
I just need help with the attached problem. I shall be grateful to you if you could help me please, i have my exam soon

 

[The Sarcastic Retard]

Practice this paper for S1 : http://themathelp.com/pdf/a level s1.pdf

 

[slisjunknown]

Practice this paper for S1 : http://themathelp.com/pdf/a level s1.pdf

Where is the marking scheme??????

 

[The Sarcastic Retard]

Where is the marking scheme??????

No ms. :/

 

[Amy Bloom]

Actually i finished my Alevels long back Was just a question from a biostatistics paper of my Uni which i got trouble with Anyways its over now. Good luck all xx