Question

Which of the following percentages accurately estimates the area under a normal curve to the left of a z-score of 1.23?
A. 10.93 percent
B. 0.8907 percent
C. 89.07 percent
D. 0.1093 percent

Answer 1

To find the area under a normal curve to the left of a z-score of 1.23, you can look up the z-score in a standard normal distribution table or use a calculator that provides cumulative distribution function values for the normal distribution.

The cumulative area to the left of a z-score of 1.23 is approximately 0.8907, or 89.07% when expressed as a percentage.

Therefore, the correct answer is:

C. 89.07 percent