28. Scores on a certain pediatric sleepiness scale are known to have a mean of 16.5 with a standard deviation of 4.2. You take a random sample of 120 children and administer the sleepiness scale to them. i) Is this problem about the sample mean or about the sample proportion? ii) Check the conditions for the sampling distribution. iii) What is the sampling distribution of the statistic? iv) Can we answer probability questions for this