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Unformatted text preview: deviation of 10 minutes. a) About what percentage of the time will the bus arrive between 7:25 and 7:35? b) About what percentage of the time will the bus arrive between 7:15 and 7:45? c) If you want to have a 95% certainty that you will catch the bus (that is, you arrive before the bus does), what time should you arrive at the stop? d) 90% of the time, the bus will arrive no later than _________. 10. Final exam scores for a college statistics class were approximately normally distributed, with an average of 72% and an SD of 8%. a) About what percentage of the class got better than an 80%? b) About what percentage of the class got less than a 60%? c) One student scored an 87%. What percentile rank did he have in the class? d) Find the 75 th percentile score for the test....
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 Spring '08
 Patton
 Statistics

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