Z-score Classwork

For Mrs. V: mean = 55 and standard deviation = 19

For Mr. T: mean = 33 and standard deviation = 10.5

Mary Beth is very proud of the score of 80 that she earned in Mrs. V's class. Albert is equally proud of the score of 42 he earned in Mr. T's class. Who has the better score?

• Mary Beth

• Albert

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

• 298

• 296

• 220

• 380

Find the Z-score.

Mean = 22

Standard Deviation: 3.1

x = 29

• 2.26

• 16.45

• -2.26

• 1.26

Find the Z-score.

Mean = 21

Standard Deviation: 1.3

x = 22

• 0.77

• 5.33

• 1.07

• 1.26

Find the z-score.

Mean = 38

Standard Deviation: 1.2

x = 42

• 3.33

• -3

• 3.03

• -3.33

Find the z-score.

Mean = 45

Standard Deviation: 2.1

x = 50

• 2.38

• 3.00

• 3.08

• 2.33

• It means you did better than zero people.

• It means you scored the same grade as the average grade.

• It means you earned a zero on the quiz.

• It means the average score was a zero.

• z = 2.33

• z = 0.6875

• z = 1.16

• z = 2.05

• True

• False