According to a report from a business intelligence company. smartphone owners are using an average of 23 apps per month. Assume that number of apps used per month by smartphone owners is normally.r distributed and that the standard deviation is 5. Complete parts {a} through (d) below. a. If you select a random sample of 1B smartphone owners. what is the probability that the sample mean is between 22.5 and 23.5? .311 (Round to three decimal places as needed.) I). If you select a random sample of 15 smartphone owners. what is the probability that the sample mean is between 22 and 23? .258 (Round to three decimal places as needed.) c. If you select a random sample of 144 smartphone owners, what is the probability that the sample mean is between 22.5 and 23.5? CI (Round to three decimal places as needed.)