Scores on the Gillian Autism Rating Scale (GARS) are normally distributed with a mean of 100 (µ =100) and a standard deviation of 15(σ=15). A sample of 64(n= 64) GARS scores is randomly selected and the sample mean is computed. a. Describe the distribution of such sample means? b. What is the mean of all such sample means? c. What is the standard deviation of all such sample means?