jerilynsocool7335 jerilynsocool7335
  • 15-03-2018
  • Mathematics
contestada

For random variable x, it is known that e[x] = 2 and v ar(x) = 3. find e[x2

Respuesta :

LammettHash
LammettHash LammettHash
  • 15-03-2018
[tex]\mathbb V(X)=\mathbb E(X^2)-\mathbb E(X)^2[/tex]
[tex]\implies3=\mathbb E(X^2)-2^2[/tex]
[tex]\implies\mathbb E(X^2)=7[/tex]
Answer Link

Otras preguntas

Geometry math question no Guessing and Please show work thank you
Help? Thank you so much
Please help me! Find the length of the unknown side of each triangle. Give the exact length and an approximate length. A right triangle has one leg with unkno
_____ products use a technology called object linking and embedding (ole) that allows content to be treated as objects that can be inserted into different softw
9-8x=35 explain please
is it true that lines of latitude have an effect on climate because where a land mass is located on the globe
Why is it not a good idea to store iodine in a plastic bag?
Which quotation shows Jacques in a positive light? "He was supposed to be sensual and a fast liver. It was therefore by the mere grace of the form that he was a
I need help on this question plz
A wave is traveling in a string at 58 m/s. when the tension is then increased 17%, what will be the resulting wave speed?