Using Z-scores

What percent of scores are below a z-score of  $z=-1.02$ ?  (You can also use the z-table from last class's work!)

• 15.87%

• 15.39%

• 9.68%

• 84.61%

Tags

CCSS.HSS.ID.A.4

CCSS.HSS.MD.A.1

What is the value of the mean on this Normal Curve?

• 6

• 34

• 52

• 70

Tags

CCSS.HSS.ID.A.2

CCSS.HSS.ID.A.3

CCSS.HSS.ID.A.4

CCSS.HSS.MD.A.1

CCSS.HSS.MD.A.2

CCSS.HSS.MD.A.3

What percent of scores are below a z-score of  $z=2.34$ ?  (You can also use the z-table from last class's work.)

• 99.04%

• 0.96%

• 98.93%

• 97.68%

Tags

CCSS.HSS.ID.A.4

CCSS.HSS.MD.A.1

A data set has a mean of 290 and a standard deviation of 20. Calculate the z-score for 265.

• $z=250.5$

• $z=1.25$

• $z=-1.02$

• $z=-1.25$

Tags

CCSS.HSS.ID.A.4

What percent of values are less than 46?

• 16%

• 84%

• 46%

• 12.5%

Tags

CCSS.HSF-LE.A.1B

The z-table gives the percent of data at or below a z-score.

• True

• Sometimes true, sometimes false

• False

Tags

CCSS.HSS.ID.A.4

What is the probability that a score is above (right of) -.64?

• .2643

• .7357

• .7389

• .2611

Tags

CCSS.HSS.ID.A.4

What is the probability that a score will fall between 1.12 and 1.94 standard deviations?

• .0905

• .1052

• .0850

• .0672

Weights of wallabies are normally distributed with a mean of 9lbs and a standard deviation of 1.5lbs. Which weight would correspond to a z-score of -2?

• 9lbs

• 10.5lbs

• 7.5lbs

• 6lbs

• 12lbs

Tags

CCSS.HSS.ID.A.4

A national achievement test is administered annually to 3rd graders. The test has a mean score of 100 and a standard deviation of 15. If Jane's z-score is 1.20, what was her score on the test?

• 82
• 88
• 100
• 118