CS1 CH6 Q.6.10

In this X ~ N(100,10) and Y ~ N(90,5) in 000s
For X, n=10 and for Y, n=5
X(bar) ~ N(100,1) and Y(bar) ~ N(90,5)

But they have used value of X and Y in the solution


P. S I don't know whether I am allowed to post photo of the question and the solution.

 

i think u didnt read the question clearly 10000 is standard deviation, hence in 1000s mean 10, 10^2 divided 10 is 10, and similary 5^2 didved by 5 is 5. so the solution is correct . check again and let me know.
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tanq!!

 

Thanks alot. I missed that..