Z-score chart & probabilities

Which of the following z-scores represents doing the "best" compared to the data set?

• -1.25

• 0

• 1.25

• 2

Using your z-score chart, what proportion of values are to the LEFT of z = -1.36?

• 0.0708

• 0.0885

• 0.0869

• 0.0853

Using your z-score chart, what proportion of values is to the LEFT of z = 2.3?

• 0.9893

• 0.9901

• 0.9788

• 0.95

Using your z-score chart, what proportion of values is to the RIGHT of z = 1.79?

• 0.9633

• 0.9625

• 0.0367

• 99.0367

Using your z-score chart, what proportion of values is to the RIGHT of z= -0.73?

• 0.2327

• 0.2358

• 0.7673

• 99.2327

Which description best fits the proportion to the LEFT of a z-score?

• Less than that z-score

• Less than or equal to that z-score

• Greater than that z-score

• Greater than or equal to that z-score

Which description best fits the proportion to the RIGHT of a z-score?

• Less than that z-score

• Less than or equal to that z-score

• Greater than that z-score

• Greater than or equal to that z-score

If you are using your calculator to find the probability shaded in this picture, what would you type in your calculator when you get to: 2nd --> VARS --> NORMALCDF(

If you are using your calculator to find the probability shaded in this picture, what would you type in your calculator when you get to: 2nd --> VARS --> NORMALCDF(

We are trying to find the score "k" that would land in the 90th percentile.

We go to our calculator and press 2nd --> VARS, then....

• normalpdf(

• normalcdf(

• invNorm(

• invT(