variables aleatorias Flashcards

1
Q

qué es una variable discreta

A

variable cuyo rango es numerable

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2
Q

define variable contínua

A

variable cuyo rango no es numerable

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3
Q

la función de probabilidad puede ser negativa?

A

falso.

f(x)>= 0

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4
Q

La función acumulativa es:

A

No decreciente.

oscila entre 0 y 1

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5
Q

puede la media ser negativa

A

si. Depende de la variable (contínua)

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6
Q

si se tienen dos variable independientes, var(aX +bY)=

A

a^2 var(x) + b^2 var(y)

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7
Q

variancia en momentos es

A

segundo momento con respecto a la media.

E[ x- u]^2

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