Assume that the mid-upper arm circumference in a population of rural Chinese children aged 12 to 60 months follows a Normal distribution with unknown mean, m. Five samples each of four children are drawn from this population by a formal process of random sampling with replacement. The results are shown in Table 3. (a) Calculate the sample mean and standard deviation for the 5th random sample number (the last sample). (b) Calculate the 95% CI of the population mean using the data of 5th sample. Table 3 Mid-upper arm circumference (mm) in a rural Chinese population aged 12 to 60 months (5 random samples with size 9)