Understanding Percentiles in Normal Distribution

This lesson demonstrates how to find a data value in a normal distribution corresponding to a given percentile using Desmos. It covers calculating the 90th and 75th percentiles for a test with a mean score of 82 and a standard deviation of 5.5. The video includes step-by-step instructions for using Desmos to find these percentiles and verify them graphically.

What is the mean score of the test mentioned in the lesson?

• 85

• 82

• 80

• 90

Which website is used to determine the data value of a normal distribution in this lesson?

• Coursera

• EdX

• Desmos

• Khan Academy

What function is used in Desmos to find the 90th percentile?

• Normal Dist

• Mean

• Inverse CDF

• Standard Deviation

What is the approximate test score for the 90th percentile?

• 90.00

• 85.71

• 89.05

• 82.00

What is the purpose of graphing the normal distribution in Desmos?

• To find the mean

• To verify the percentile

• To determine the mode

• To calculate the standard deviation

What percentile is referred to as the third quartile?

• 25th

• 90th

• 50th

• 75th

What value should be entered in Desmos to find the 75th percentile?

• 0.50

• 0.25

• 0.75

• 0.90

What is the approximate test score for the 75th percentile?

• 82.00

• 85.71

• 90.00

• 89.05

How is the area to the left of a test score verified in Desmos?

• By changing the mean

• By altering the minimum value

• By adjusting the standard deviation

• By setting the max to the test score

What is the final step in verifying the test score on the graph?

• Typing the test score equation

• Altering the distribution type

• Adjusting the standard deviation

• Changing the mean