Which of the following is not a commonly used practice? choose the correct answer below. a. if the original population is normally distributed, then for any sample size n, the sample means will be normally distributed. b. if the distribution of the sample means is normally distributed, and ngreater than30, then the population distribution is normally distributed. c. the distribution of sample means gets closer to a normal distribution as the sample size n gets larger. d. if the original population is not normally distributed and ngreater than30, the distribution of the sample means can be approximated reasonably well by a normal distribution.