Let the observations `x_1(1 le I le 10)` satisfy the equations, `Sigma_(i=1)^(10)(x_1-5)=10` and `Sigma_(i=1)^(10) (x_i-5)^2=40`. If `mu` and `lamda` are the mean and the variance of the observations, `x_1-3, x_2-3, …, -3, ` then the ordered pair `(mu, lamda)` is equal to :
A. `(3,3)`
B. `(6, 3)`
C. `(6,6)`
D. `(3, 6)`
