The membrane filter technique is used to test a polluted water sample for coliform group. Three different dilutions of the water sample were prepared and each was filtered through 5 filter membranes. The colonies' counts corresponding to each dilution are presented below. Calculate the coliform count per 100 ml using the most valid data. Sample Volume (mL) Sample diluted to mL 10 100 1000 1 1 1 Colonies count on membrane #2 #3 #4 #5 270 267 301 310 44 32 52 40 6 3 3 #1 295 56 2 4