Question

for the standard normal curve, find the z - score that corresponds to the 90th percentile. click to view page 1 of the table. click to view page 2 of the table.

a. 0.28
b. 1.52
c. 2.81
d. 1.28

Explanation:

Step1: Understand percentile meaning

The 90th percentile means that the area to the left of the z - score under the standard normal curve is 0.90.

Step2: Use z - table

We look up the value closest to 0.90 in the body of the standard normal (z -) table. The closest value to 0.90 in the standard normal table gives a z - score of approximately 1.28.

Answer:

D. 1.28