Standard Score Problems
Standard Score ProblemsAssuming a population mean of 500 and a population standard deviation of 100 for the verbal subtest of the SAT exam: 1. What percentage of the student population has SAT-V scores greater than 600? 2. What percentage of the student population has SAT-V scores greater than 700? 3. What percentage of the student population has SAT-V scores lower than 420? 4. What percentage of the student population has SAT-V scores between 300 and 520? 5. What percentage of the student population has SAT-V scores between 250 and 600? 6. What percentage of the student population has SAT-V scores between 500 and 550? 7. A student gets a 620 on this test. Convert this to a percentile.8. 7. A student gets a 340 on this test. Convert this to a percentile.Answers1. What percentage of the student population has SAT-V scores greater than 600? z = (600–500) / 100 = 100/100 = 1.0 Percentage = 15.87 2. What percentage of the student population has SAT-V scores greater than 700? z = (700–500) / 100 = 200/100 = 2.0 Percentage = 2.283. What percentage of the student population has SAT-V scores lower than 420? z = (420–500) / 100 = -80/100 = -0.8Percentage = 21.194. What percentage of the student population has SAT-V scores between 300 and 520? z1 = (300–500) / 100 = -200/100 = -2.0Percentage1 = 47.72z2 = (520–500) / 100 = 20/100 = 0.2Percentage2 = 7.93Total = 47.72+7.93 = 55.655. What percentage of the student population has SAT-V scores between 250 and 600? z1 = (250–500) / 100 = -150/100 = -2.5Percentage1 = 49.38z2 = (600–500) / 100 = 100/100 = 1.0Percentage2 = 34.13Total = 49.38+34.13 = 83.516. What percentage of the student population has SAT-V scores between 500 and 550? z = (550–500) / 100 = 50/100 = 0.5Percentage = 19.157. A student gets a 620 on this test. Convert this to a percentile.z = (620–500) / 120 = 120/100 = 1.20Percentage = 88.48 (38.49+50.00)8. A student gets a 340 on this test. Convert this to a percentile.z = (340–500) / 100 = -160/100 = -1.6Percentage = 5.48 ................
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