MathematicsMedium89×since 2002Q5482Let the six numbers a1,a2,a3,a4,a5,a6\mathrm{a_1,a_2,a_3,a_4,a_5,a_6}a1,a2,a3,a4,a5,a6, be in A.P. and a1+a3=10\mathrm{a_1+a_3=10}a1+a3=10. If the mean of these six numbers is 192\frac{19}{2}219 and their variance is σ2\sigma^2σ2, then 8σ2\sigma^2σ2 is equal to :A220B210C105D200Check answerSkip