Additional Practice Problems Your mean is 5 and your population standard deviation is 1.5. What would someone need to score in the population to be in the bottom 7th percentile? X = (-1.48)*(1.5)+5 X = 2.78 Your mean is 25 and your population standard deviation is 10. What would someone need to score in the population to be in the top 30th percentile? X = (0.52)*(10)+25 X = 30.2 Your mean is 80 and your population standard deviation is 34. What would someone need to score in the population to be in the 96th percentile? X = (1.75)*(34)+80 X = 139.5 Your mean is 156 and your population standard deviation is 50. What would someone need to score in the population to be in the 14th percentile? X = (-1.08)*(50)+156 X = 102 Your mean is 3.1 and your population standard deviation is 0.5. What would someone need to score in the population to be in the top 10%? X = (1.28)*(0.5)+3.1 X = 3.74 Your mean is 100 and your population standard deviation is 35. What would someone need to score in the population to be in the 90th percentile? X = (1.28)*(35)+100 X = 144.8 Your mean is 70 and your population standard deviation is 28. What would someone need to score to be better than 76% of the population? X = (0.71)*(28)+70 X = 89.88 Your mean is 256 and your population standard deviation is 80. Between which two values would an individual in the population need to score to be in the middle 40 th percentile? X = (0.52)*(80)+256 X = (-0.52)*(80)+256 X = 297.6 X = 214.4 Your mean is 15 and your population standard deviation is 6. Between which two values would an individual in the population need to score to be in the middle 75 th percentile? X = (1.15)*(6)+15 X = (-1.15)*(6)+15 X = 21.9 X = 8.1