I'd suggest getting a Texas Instruments TI-84 plus calculator or use des mos .com scientific
I don't btgcygljhbihlihnjknkl;n
2 answers:
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Answer:
The answer is option 3.
Step-by-step explanation:
In order to solve the inequality, you have to get rid of -3 by adding 3 to both sides :
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: