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  • 310 votes cast
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
Mar
7
comment Determining If A Relation Is A Function
@Avatar And because every domain value can't be mapped to some co-domain value, it isn't a function?
Mar
7
accepted Determining If A Relation Is A Function
Mar
7
comment Determining If A Relation Is A Function
@MichaelTouitou With the restricted domain in your answer, it would be a function but still not onto?
Mar
7
comment Determining If A Relation Is A Function
So, do we ever have to worry about the domain? Also, here is the definition my book gives: "Let $A$ and $B$ be nonempty sets. A function $f$ from $A$ to $B$ is an assignment of exactly one element of $B$ to each element of $A$. We write $f(a)=b,$ if $b$ is a unique element of $B$ assigned by the function $f$ to the element $a$ of $A$." What are the key words in the definition that would make me think that the entire range has to be defined?
Mar
7
asked Determining If A Relation Is A Function
Mar
6
accepted Finding The Contour Maps Of A Function Of Two Variables
Mar
6
comment Finding The Contour Maps Of A Function Of Two Variables
So, the reason why the plus/minus sign is put in front of $e^c$ is because the directed distance between $y$ and $x^2$, can be positive or negative? And if I choose $c=1$, then I can only choose x and y values such that the distance between them is always $e^1$?
Mar
6
revised Finding The Contour Maps Of A Function Of Two Variables
edited tags