The community of Enviro, US (population 26,300) tests its drinking water supply for coliform organisms by the fermentation tube method (five 10 ml portions per sample). The results for October 2012 are tabulated below: No. of Samples No. of + portions No. of - portions 2 5 0 3 4 1 4 3 2 0 2 3 5 1 4 25 0 5 a) Calculate the monthly average MPN. b) Did the city comply with EPA regulations for sample frequency? c) Did the samples tested comply with the regulations? What would be considered a non- compliance?