hi could someone please help me with this question:
Q) Y~N(50,sigma^2), P(Y>40)=0.6554, find sigma.
I have a rough idea of how to do it and i know the answer is sigma=25 but i cannot get to this answer just wondering if someone could please break it down for me so i can see where i am going wrong.
thanks
I can see that. But what I'm telling you is that your value is wrong. How can z* possibly be greater than zero when the value for Y is less than the mean?!
You have made a mistake. Unless you accept this fact and then show your working on how you got this incorrect value, I have nothing more to say.