$*4\mathrm{.}60$ The table below compares the accuracy of two forecasting methods used by company XYZ to forecast its monthly sales of one of its product. The data pertain to the forecast and actual sales levels over a period of five months. What is the value of the tracking signal as of the end of May? Which method provides beter tarecast accuracy?

$\backslash$table$[[$MONTH$,$ACTUAL SALES,Forecast$],[,$METHOD A$,$METHOD B$,],[$Jan$,\frac{39}{30},\frac{43}{26},\frac{43}{22},],[$Feb$,\frac{40}{40},39,\frac{37}{37},],[$Mar$,\frac{40}{39},37,43,],[$Apr$,,41,,]]$