The blood cholesterol level of all men aged 20 to 34 years follows the Normal distribution with mean = 188 milligrams per decilliter (mg/dL) and standard deviation = = 41 mg/dL. A sample survey measures the blood cholesterol level of a SRS of 10 such men. The sample mean is denoted by . The sampling distribution of the sample mean is a) x=188 mg/dL and s = 12.965. b) approximately Normal with mean (x) = 188 mg/dL and standard deviation a(x) = 4.1 mg/dL. c) d) approximately Normal with mean (x) = 59.451 mg/dL and standard deviation (x) = 12.965. approximately Normal with mean (x) = 188 mg/dL and standard deviation (x) = 12.965 mg/dL.