Question

How do I solve this problem?

Answer 1

`d/(dm)sum_(i=1)^n(x_i-m)^2=-2sum_(i=1)^n(x_i-m)`

Explanation:

`d/(dm)sum_(i=1)^n(x_i-m)^2`

= `sum_(i=1)^n[2(x_i-m)*(-1)]`

= `-2sum_(i=1)^n(x_i-m)`