Simpson rule

5 [electrical principles] An a.c. current, i, varies with time, t, according to the following table: t (s) 0 0.1 0.2 0.3 0.4 0.5 0.6 i (A) 0.0 0.25 0.31 0.43 0.37 0.20 0.0 The RMS current, iRMS, is given by 1 0.6 iRMS =V- 12 dt 0.6 Jo Find an approximate value for RMS