Aresearcher collects a simple random sample of grade-point averages of statistics students, and she calculates the mean of this sample. Under what conditions can that sample mean he treated as a value from a population having a non'nal distribution? Seled all that apply. If the population of statistics students has a normal distribution. The sample has more than 30 grade-point averages. If the population of gradepoint averages has a normal distribution. POP?\" The researcher collects more than 30 samples