What percentage corresponds to a z-score of 1.28?

• 89.973

• 1.2903

• 10.03

• 31.23

What percentage corresponds to a z-score of -1.28?

• 89.973

• 1.2903

• 10.03

• 31.23

What percentage corresponds to a z-score of 0.14?

• 91.924

• 1.2903

• 10.03

• 55.567

What percentage corresponds to a z-score of 3.9?

• 91.924

• 1.2903

• 99.995

• 55.567

What percentage corresponds to a z-score of -4.1?

• 100%

• 110%

• 4%

• The normal bell curve only includes a maximum of 4 standard deviations from the mean, so a z-score would be 4 at most.

μ = 10 , σ = 5 , X = 12 . Find z-score

• 0.3
• 0.4
• 0.5
• 0.6

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

• $z=250.5$

• $z=1.25$

• $z=-1.02$

• $z=-1.25$

What is the standard deviation on this Normal Curve?

• 6

• 12

• 34

• 18

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

• 6

• 34

• 52

• 70

If heights of 3rd graders follow a normal distribution with a mean of 52 inches and a standard deviation of 2.5 inches, what is the z score of a 3rd grader who is 47 inches tall? 

• -5
• -2
• 2
• 5