you cannot get that answer.... when you divide. Put the number into a fraction first so, it makes it easier to see what you are doing. So,
Mrs.Perez was looking at her back account statement. She noticed that her beginning balance was $500, and she added nothing to h
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you cannot get that answer.... when you divide. Put the number into a fraction first so, it makes it easier to see what you are doing. So,
Answer:
Step-by-step explanation:
For this case we can use the moment generating function for the normal model given by:
And this function is very useful when the distribution analyzed have exponentials and we can write the generating moment function can be write like this:
And we have that the moment generating function can be write like this:
And we can write this as an infinite series like this:
And since this series converges absolutely for all the possible values of tX as converges the series e^2, we can use this to write this expression:
and we can use the property that the convergent power series can be equal only if they are equal term by term and then we have:
And then we have this:
And then we can find the
And we can find the variance like this :
And first we find:
And then the variance is given by: