Calculating Percentages Within One Standard Deviation of the Mean

This video tutorial explains how to determine the percentage of data that falls within a certain standard deviation of the mean. Using a sample of 14 quiz scores, the video demonstrates how to calculate the range of scores within one standard deviation of the mean. The process involves adding and subtracting the standard deviation from the mean to find the range, and then analyzing a dot plot to count the scores within this range. The result shows that 71% of the scores fall within one standard deviation of the mean.

What is the main goal of the video tutorial?

• To find the median of a dataset

• To learn how to calculate the mean of a dataset

• To understand how to create a dot plot

• To determine the percentage of data within a certain standard deviation of the mean

What is the sample mean of the quiz scores mentioned in the video?

• 2.6

• 5.2

• 3.9

• 1.3

How do you calculate the range within one standard deviation of the mean?

• Add and subtract the standard deviation from the mean

• Multiply the mean by the standard deviation

• Divide the mean by the standard deviation

• Add the mean and standard deviation

What is the lower bound of the range within one standard deviation of the mean?

• 2.6

• 5.2

• 3.9

• 1.3

How many quiz scores fall within one standard deviation of the mean?

• 7

• 10

• 5

• 14

What percentage of the quiz scores are within one standard deviation of the mean?

• 71%

• 50%

• 100%

• 85%