Z score practice

What is the formula to find the z-score for population?

• z=X-M

• z=σ-M/μ

• ^z/M=μ

• z=X-μ/σ

Tags

CCSS.HSS.ID.A.4

Find the Z-score.

Mean = 22

Standard Deviation: 3.1

x = 29

• 2.26

• 16.45

• -2.26

• 1.26

Find the value for

P(Z < -0.386)

• 0.3498

• 0.3520

• 0.3501

• 0.6502

For a certain type of computer, the length of time between charges of the battery is normally distributed with a mean of 50 hours and a standard deviation of 15 hours. John owns one of these computers and wants to know the probability that the length of time will be between 50 and 70 hours.

• 0.9082

• 0.8989

• 0.5000

• 0.4087

Tags

CCSS.HSS.ID.A.4

• 298

• 296

• 220

• 380

Tags

CCSS.HSS.ID.A.4

• 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.

Kellogg's cereal has an average of 7.6 g of sugar with an SD of 4.5g.

What is the Z-score of Frosted Flakes if it has 11g sugar?

• +0.76

• -0.74

• +0.68

• +0.28