Finding z-values and x-values

Which z-score has an area to the left of 0.0068?

• z = 2.47

• z = 2.4

• z = -2.47

• z = -2.4

Tags

CCSS.HSS.ID.A.4

Which z-score has an area to the right of 0.0197?

• z = 2.06

• z = -2.06

• z = 2.60

• z = 2.44

Tags

CCSS.HSS.ID.A.4

What are the z-values that hold the center 94% of the data?

Tags

CCSS.HSS.ID.A.4

IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. What score represents the 75th percentile?

• 0.67

• 110.05

• -89.95

• 111.25

Tags

CCSS.HSS.ID.A.4

Composite ACT scores are normally distributed with a mean of 22 and a standard deviation of 4.5. What score is the lowest score needed to be in the top 15% of test takers?

• 1.04

• 22.675

• 17.32

• 26.68

Tags

CCSS.HSS.ID.A.4

Female life expectancies are normally distributed with a mean of 89 and a standard deviation of 8.2 years. Which life expectancies hold the center 80%?

• 78.504 and 99.496

• 82.112 and 95.888

• 82.44 and 95.56

• 81.62 and 96.38