Mack
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 Mar 10 accepted Finding the x and y values such that the partial derivatives are zero simultaneously (part two) Mar 10 comment Finding the x and y values such that the partial derivatives are zero simultaneously (part two) Oh, I see. Thank you, Cameron! Mar 10 comment Finding the x and y values such that the partial derivatives are zero simultaneously (part two) Yes, that is what I did. Then I had simultaneous equations, $2y = 0$ and $2x = 0$. When I added the two equations together, I got $2x +2y = 0 \implies y = -x$. Mar 10 asked Finding the x and y values such that the partial derivatives are zero simultaneously (part two) Mar 10 accepted Finding the $x$ and $y$ values such that the partial derivatives are zero simultaneously Mar 10 comment Finding the $x$ and $y$ values such that the partial derivatives are zero simultaneously What I meant is that I didn't check if each partial derivative is equal to 2 at the same x and y values. Mar 10 comment Finding the $x$ and $y$ values such that the partial derivatives are zero simultaneously Oh, I see! So, the way I solved it gives me more solutions than I want. It includes the point when they are both zero, but it also includes when they are both, say, 2 (I didn't actually verify if they actually equal each other at that value). Is that correct to think? Mar 10 comment Finding the $x$ and $y$ values such that the partial derivatives are zero simultaneously Well, I figured since that both the partial derivatives were equal to zero, then they must equal each other. Why can't I just simply set them equal to zero? Mar 10 asked Finding the $x$ and $y$ values such that the partial derivatives are zero simultaneously Mar 9 comment Standardized Normal Distribution Problem Yes, that is what I get too. The answer keys says that 0.1336 is the answer. Mar 9 comment Standardized Normal Distribution Problem I'm terribly sorry. This was a question I was going to ask, but decided not to; and stackexchange saved the title. Mar 9 asked Standardized Normal Distribution Problem Mar 9 comment Determining The Value, c, A Random Variable Assumes I'm sorry. I think I am still a little confused about this problem. I thought that I was suppose to find two c-values, they being equal but having opposite sign. Furthermore, I thought I was suppose to find the area of the left and right tails. Mar 8 accepted Determining The Value, c, A Random Variable Assumes Mar 8 comment Determining The Value, c, A Random Variable Assumes Oh, I see. Shouldn't $P(Z \le c) = 1 - 0.008$ actually be $P(Z \ge c)$? Mar 8 comment Determining The Value, c, A Random Variable Assumes I'm sorry, but I still don't follow. How did you rewrite $P(|Z| \ge c)$, to solve for the c-value? Mar 8 revised Determining The Value, c, A Random Variable Assumes added 2 characters in body Mar 8 comment Determining The Value, c, A Random Variable Assumes Oh, I am terribly sorry. I forgot to type the absolute bars in the original question. How did you arrive at that answer? Mar 8 comment Determining The Value, c, A Random Variable Assumes They got 2.41 as an answer. I can't how that is true. Mar 8 asked Determining The Value, c, A Random Variable Assumes