MathematicsEasy89×since 2002Q5447If mean and standard deviation of 5 observations x₁, x₂, x₃, x₄, x₅ are 10 and 3, respectively, then the variance of 6 observations x₁, x₂, ….., x₅ and –50 is equal toA582.5B507.5C586.5D509.5Check answerSkip