Understanding Normal Distribution with a Graphing Calculator

This lesson demonstrates how to use a free online graphing calculator to determine normal distribution probabilities. It covers calculating the probability of test scores being greater than 75, less than 85, and between 70 and 90, using the normal CDF function. The video also highlights the calculator's features and how to access help resources.

What is the mean of the normally distributed test scores mentioned in the video?

• 70

• 85

• 72

• 75

Which function is used on the calculator to determine normal distribution probabilities?

• normal PDF

• normal CDF

• normal IDF

• normal SDF

What is the default mean value when using the normal CDF function without specifying it?

• 8.2

• 72

• 1

• 0

In the example where X is greater than 75, what is used as the exaggerated upper bound value?

• 90

• 85

• 99999

• 10000

What is the approximate probability that a test score is greater than 75?

• 0.944

• 0.357

• 0.518

• 0.582

For the probability that X is less than 85, what is used as the exaggerated lower bound value?

• -99999

• 75

• -10000

• 70

What is the approximate probability that a test score is less than 85?

• 0.582

• 0.357

• 0.518

• 0.944

In the example where X is between 70 and 90, what is the mean value used?

• 72

• 75

• 85

• 70

What is the approximate probability that a test score is between 70 and 90?

• 0.357

• 0.518

• 0.582

• 0.944

Where can you find more information about the normal CDF function in the calculator?

• Settings

• Function reference

• User guide

• Help button