l The time spent on playing Mobile Legend per day by an undergraduate student normally distributed with an average of 7.5 hours and a standard deviation of 2.4 hours. If a marcher selects a random sample of 36 players among the students, what is the probability that the sample mean is between 7 and 8 hours? 0.4000 0.7883 0.1056 0.8944 9.055? Q16m& GP; Q. The UMS Eleaming Cenbe stores information on the study habits of its fulltime students. Their studies indicate thatthe mean amount of time undergraduate students' study per week is 20 hours. The hours studied follows the normal distribuon with a standard deviation of six hours. Suppom we select a random sample of 144 current students. What is the probability that the mean of this sample '6 between 19 hours and 20 hours? A. 0.0228 B. 0.4772 C. -2.0000 D. Cannot be calculated based on the given information. 3 Suppose we select a random sample of 144 cun'ent students. What Is the probability that the mean of this sample is Iem than 19.25 hours? A. 0.4332 B. 0.8664 C. 0.0668 D. 0.0181 Qq-Qr I Lllr. Um would like to conduct a study on TIkTok wage among FII'EIJ Year 1 undergraduate students. A random sample of 70 students ls taken from the population size of 500. It is noted that the mean is 220 and variance is 324. Calculate the standard error of the sample mean. A. 38.7254 B. 2. 1514 C. D 1.9971 . Cannot be calculated based on the given information. 4'. What is the probability that the sample mean is greater than 215? A. {1.0714 B. 0.0062 C. 0.9938 D. 1.4857