Understanding Normal Distribution and TI-84 Calculator

This video tutorial demonstrates how to use the TI-84 graphing calculator to find a test score based on a given probability in a normal distribution. It covers the setup of the problem, modeling the distribution curve, and using the calculator's inverse norm feature. The tutorial also explains the concept of percentiles and their relevance in interpreting test scores.

What is the mean score of the class exam mentioned in the video?

• 80

• 65

• 70

• 75

What is the standard deviation of the exam scores?

• 12

• 10

• 8

• 5

In a normal distribution, what percentage of data falls between the mean and one standard deviation above the mean?

• 34%

• 50%

• 68%

• 95%

Which feature of the TI-84 calculator is used to find a test score given a probability?

• Normal CDF

• Standard Deviation

• Normal PDF

• Inverse Norm

What is the probability to the left of the test score C that we are trying to find?

• 0.72

• 0.82

• 0.52

• 0.62

What is the first step in using the inverse norm feature on a newer TI-84 operating system?

• Enter the area to the right

• Enter the mean

• Enter the standard deviation

• Enter the area to the left

What is the correct sequence to access the inverse norm feature on the TI-84 calculator?

• Second, Vars, Option 1

• Second, Vars, Option 4

• Second, Vars, Option 2

• Second, Vars, Option 3

What is the approximate value of the test score C found using the TI-84 calculator?

• 77.4

• 78.4

• 76.4

• 75.4

What does the 62nd percentile indicate in the context of the test score?

• The score is the average

• The score is 62

• 62% of scores are below this value

• 62% of scores are above this value

If a student scores in the 80th percentile, what does it mean?

• They scored worse than 80% of students

• They scored better than 80% of students

• Their score is 80

• Their score is the mean