某建筑公司近期混凝土强度的30组统计资料如下(单位:MPa):27.65,26.43,38.42,38.22,36.54,37.42,33.16,34.18,36.87,34.2,26.1,35.7,26.54,36.73,43.57,26.87,30.2,29.8,34.2,37.6,40.8,42.65,35.4,30.52,36.7,31.3,32.75,30.52,32.2,25.96。(1)现要求配制C30级混凝土,试求混凝土的配制强度。(2)若实验室配制的混凝土配合比为1∶2.65∶5.23,水灰比为0.5,现场实测砂含水率为2.5%,石子含水率为3.4%,试求施工配合比及水灰比。