Standard Normal Questions:

What is the area/prob less than z = 1.75?

What is the area/prob less than z = -1?

What is the area/prob between 1.5 and –1.5?

What is the area/prob between –1.25 and 1.5?

(Other type of question):

Find the value that is larger than 80% of the z.

Find the value that is larger than 20% of the z.

Find the ±z that contain 80% of all z.

Z-transformation Questions:

If X = IQ, mean = 100, and s = 15 find:

What percentage of people have IQs between 80 and 120?

What percentage of people have IQs between 90 and 130?

What percentage of people have IQs above 125?

What are the IQs, symmetrical around the mean, that contain 90% of all people?

90% of the population is below what level of IQ?

What is the cut-off value for the top 1% of IQs?