Solving Random Variable x | Maria Seeking Help

maria69
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Hi if someone can please help me to this question? PLease?
Thank you
maria
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Please define S!
 


Sorry i forgot to mention what S is. Here:
http://img682.imageshack.us/img682/3866/question4.jpg
i have done part (i) but i can't do part (ii)
Can you please help??
Thank you
Maria
 
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V(S)=E(S2)-E(S)2
E(S2)=σ2
V(S) must be > 0, otherwise S would not be random.
Therefore E(S) must be < σ.
 
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