Math, asked by shreyas12345, 1 year ago

if the sd of x is 3 what is the variance of 5-2x​

Answers

Answered by snickelfrits7
26

Answer:

9

Step-by-step explanation:

If SD is 3 Then var is 3^2 =9 Var (x) = 9 Addition /subtraction of a number has no effect on variance

Answered by windyyork
98

Answer: The value of variance of 5-2x is 36.

Step-by-step explanation:

Since we have given that

Standard deviation of x = 3

σ = 3

We need to find the value of Var(5-2x).

As we know that

Var(ax+b)=x^2\times Var(x)

so, our equation becomes,

Var(5-2x)=(-2)^2\times \sigma^2\\\\Var(5-2x)=4\times (3)^2\\\\Var(5-2x)=4\times 9\\\\Var(5-2x)=36

Hence, the value of variance of 5-2x is 36.

Similar questions