0.7×(0.25 – 0.195)2 + (0.1) ×(0.15 – 0.195)2 + (0.1) ×(0.1 – 0.195)2 + (0.1)× (–0.5 – 0.195)2
Well you can do it by hand or use Google.
If you don't understand, I can explain, but if you don't want to work it by hand, then search it on google with x's replaced with *'s.
