ASQ Exam CQE Topic 9 Question 35 Discussion

Periodically, a sample of 20 items are randomly selected from a population that is normally distributed, the average is computed, and plotted. Which of the following statements is correct?

. The average of the logarithms of the values is lognormally distributed.

. The standard deviation of the averages is equal to the standard deviation of the individuals divided by the square root of 20.

. The variance of the averages is equal to the variance of the individuals divided by the square root of 20.