A random sample of 25 college statistics textbook prices was collected and the mean price was found to be $91. What would you need to refer to in order to determine the probability of finding a sample mean of $91 or more extreme? The distribution of prices for this sample of college statistics textbooks You don't need to refer to anything since if the sample of 25 was randomly selected, then the sample mean of $91 must be close to the population mean textbook price. The distribution of sample mean textbook prices for all samples of 25 textbooks from this population The population distribution of all college statistics textbook prices