Question on mean and variance

Click the link below to see the question, I have answered all parts except for (c).

http://img38.imageshack.us/img38/1503/deatl.png

Could anyone help me with part (c).

My working so far can be seen by clicking the link below;
http://img705.imageshack.us/img705/7285/refk.png

Thanks

Last edited: Feb 12, 2012

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