Mathematics

Mathematics

Problem

The discrete random variable

X

has the following probability distribution:


$x$	1	2	4	7
$P(X = x)$	$k$	$2k$	$3k$	$4k$

a. Find the value of

k

. b. Find the variance of

X

. c. Find the variance of

20 - 5X

.

Browse the problem library