MathematicsEasy89×since 2002Q5461Consider three observations a, b, and c such that b = a + c. If the standard deviation of a + 2, b + 2, c + 2 is d, then which of the following is true?Ab² = 3(a² + c²) + 9d²Bb² = 3(a² + c²) −-− 9d²Cb² = 3(a² + c² + d²)Db² = a² + c² + 3d²Check answerSkip