Estimating frequency within part of a class
Estimating frequency within part of a class.
- Partial frequency = width of the required part × frequency density.
- Split a range at every class boundary and add the separate areas.
- This is an estimate assuming values are evenly spread within each class.
Example 1
Estimate the number of observations with
First partial frequency
Estimated frequency
Approximately 5 observations. The exact individual values are unknown.
Example 2
Estimate the number of observations with
First partial frequency
Second partial frequency
Estimated frequency
Approximately 35 observations. The exact individual values are unknown.
Your turn
Question 1
Estimate the number of observations with
Check answer
First partial frequency
Estimated frequency
Approximately 60 observations. The exact individual values are unknown.
Question 2
Estimate the number of observations with
Check answer
First partial frequency
Second partial frequency
Estimated frequency
Approximately 40 observations. The exact individual values are unknown.
Question 3
Estimate the number of observations with
Check answer
First partial frequency
Estimated frequency
Approximately 30 observations. The exact individual values are unknown.
Question 4
Estimate the number of observations with
Check answer
First partial frequency
Second partial frequency
Estimated frequency
Approximately 110 observations. The exact individual values are unknown.
Question 5
Estimate the number of observations with
Check answer
First partial frequency
Estimated frequency
Approximately 5 observations. The exact individual values are unknown.
Estimate the number of observations with
First partial frequency
Estimated frequency
Approximately 60 observations. The exact individual values are unknown.
Estimate the number of observations with
First partial frequency
Second partial frequency
Estimated frequency
Approximately 40 observations. The exact individual values are unknown.
Estimate the number of observations with
First partial frequency
Estimated frequency
Approximately 30 observations. The exact individual values are unknown.
Estimate the number of observations with
First partial frequency
Second partial frequency
Estimated frequency
Approximately 110 observations. The exact individual values are unknown.
Estimate the number of observations with
First partial frequency
Estimated frequency
Approximately 5 observations. The exact individual values are unknown.