The central limit theorem is important in statistics because it allows us to use a Normal distribution to find probabilities involving the sample mean if the population size is reasonably large (whether the population distribution is known or not).a. population is Normally distributed (for any sample size). b. sample size is reasonably large (for any population)c. population is Normally distributed and the sample size is reasonably large. d. population is Normally distributed and the population standard deviation is known (for any sample size).