B The resting blood pressures of 12 randomly selected patients were obtained while they were in a clinical setting. Is the mean of the systolic blood pressures significantly different from a population mean of 120? Use = .05two-tail. Systolic BP Data: 135, 103, 108, 117, 139, 127, 143, 131, 150, 142, 144, 121 What is the sample mean