The distribution of lengths of steel bars produced in a rolling mill is unknown. However, the mean is μ= 25.50 feet and the standard deviation is σ.1400 feet. To check the quality of the steel bars, a random sample of n= 49 steel bars is selected. Use X to denote the sample mean. The mean (or expected value) of the sample mean X is (2) The standard deviation of the sample mean X is (2) The probability that the sample mean X is less than or equal to 25.55 feet is closest to (3) The probability that the sample mean X is less than or equal to 25.45 feet is closest to (3) The probability that the sample mean X is between 25.48 and 25.52 feet is closest to (3)