Normal Distribution In-class exercises
4. A student took a statistics test. His instructor said that the test scores were approximately normally distributed with mean = 70 and standard deviation = 10. The student scored 87. What was her percentile rank? Z = (87 – 70) / 10 = 1.70. Answer = .5000 + .4554 = .9554 or Percentile rank = 95.54 Hints/answers. 1. ................
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