Normal Curve Distribution

Front

What is a normal distribution?

Back

A normal distribution is a probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean.

Front

What is the mean in a data set?

Back

The mean is the average of a set of numbers, calculated by adding all the values together and dividing by the number of values.

Front

What is standard deviation?

Back

Standard deviation is a measure of the amount of variation or dispersion in a set of values.

Front

What does the range of a data set represent?

Back

The range represents the difference between the highest and lowest values in a data set.

Front

What percentage of data falls within one standard deviation of the mean in a normal distribution?

Back

Approximately 68% of the data falls within one standard deviation of the mean.

Front

What percentage of data falls within two standard deviations of the mean in a normal distribution?

Back

Approximately 95% of the data falls within two standard deviations of the mean.

Front

What percentage of data falls within three standard deviations of the mean in a normal distribution?

Back

Approximately 99.7% of the data falls within three standard deviations of the mean.

Front

How do you calculate the range of a data set?

Back

To calculate the range, subtract the smallest value from the largest value in the data set.

Front

If the mean is 29 and the standard deviation is 3, what is the normal range (68%)?

Back

The normal range is from 26 to 32.

Front

What is a percentile?

Back

A percentile is a measure used in statistics indicating the value below which a given percentage of observations fall.