Let X1. X2, Xn be a random sample from a distribution with mean u and variance (:2. Consider the random variable. X. Which of the following properties are true? Select all that apply. On average, the sample mean is equal to the population mean. The variance of the sample mean is equal to n times the population variance. The variance of the sample mean is equal to the population variance divided by n The variance of the sample mean increases as n increases. On average. the sample mean is equal to n times the population mean. The variance of the sample mean decreases as n increases. [:JBCJCJ-CJB On average, the sample mean is equal to the population mean divided by n