[질문] V(aX+b)=a제곱V에요???

E(aX+b)=aE(X)+b=am+b이므로 V(aX+b)=E({(aX+b)-(am+b)}제곱) =E({a(X-m)}제곱) =E(a제곱(X-m)제곱) =a제곱E((X-m)제곱) =a제곱V(X) 예 맞습니다^^