A population has mean and standard deviation . A random sample of size n is selected from this population. Denote the sample mean byx and the sample standard deviation by S. Which one of the following statements is always true? Group of answer choices The population mean follows approximately a normal distribution. The sample mean x follows approximately a normal distribution. The population mean follows approximately a normal distribution when the population size is large. The sample mean x follows approximately a normal distribution when the sample size n is large