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 researcher selects a random sample of 36 players among the students, what is the probability that the sample mean is between 7 and 8 hours? A. 0.4000 B. 0.7888 C. 0.1056 D. 0.8944

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