Question

if variance of x is 5 then the variance of 2-3x is

Answer 1

Answer:

45

Step-by-step explanation:

Given: x=5

To find: var(2-3x)

Use the formula, var (cx) = $c^{2}$ var (x)

c = -3 given the question (2-3x)

In the formula, sub c = -3

var (-3x) = $(-3^{2})$ var(x)

$(-3^{2} )$ = 9

var(2-3x) = 9 var (x)

sub var(x) = 5

var(2-3x) = 9 x 5

var(2-3x) = 45

Answer = 45