Question

Given Var(X) =4 and Var(Y)
= 8, then Var(3X + Y) is:​

Answer 1

Answer:

20

Step-by-step explanation:

if X=4 and y=8:

(3x+y)

= [(3(4)+8)]

=12+8

=20

Answer 2

20

Explanation:

Var(X) =4

Var(3X) = 12

Var(Y) = 8

Var(3X + Y) = 3(4) + 8

                   = 12 + 8

                   = 20

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