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Statistics and Probability

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Moderate

Identifying Continuous Random Variables

STATS-AG1X1Y

How many of the following $X$'s are continuous Random Variables?

i. $X=$ The number of people enter a store between 1pm and 2pm.

ii. $X=$ The price of an iPhone 6 being sold at Best Buy on 07/01/2016.

iii. $X=$ Time.

iv. $X$ is a random variable with probability density function $f(x)= 2x$ for $0< x< 1$.

v. $X$ is the variance of a sample of size 50 that is to be collected from some infinitely-large population.

vi. $X$ is the investment return of a portfolio over a 1-month period.

A

$1$

B

$2$

C

$3$

D

$4$

E

$5$

F

$6$