8.47 Refer to Exercise 8.46. Find the probability of these events. a. A 2-year-old child is taller than 36 inches. b. A 2-year-old child is shorter than 34 inches. c. A 2-year-old child is between 30 and 33 inches tall. 8.48 University and college students average 7.2 hours of sleep per night, with a standard deviation of 40 minutes. If the amount of sleep is normally distributed, what proportion of university and college students sleep for more than 8 hours? 8.49 Refer to Exercise 8.48. Find the amount of sleep that is exceeded by only 25% of student
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