QUESTION $43$

What is the mean squared error $($MSE$)$ of the following forecasts?

$\backslash$table$[[$Month$,$Actual Sales,Forecast$],[$Jan$.,614,600],[$Feb$.,480,480],[$Mar$.,500,450],[$Apr$.,500,600]]$

a$)41$

b$)164$

c$)3174$

d$)136$

e$)12,696$