Numerical Data Distribution

Find the midpoints.

• 25.5, 35.5, 45.5, 55.5, 65.5, 75.5

• 20.5, 30.5, 40.5, 50.5, 60.5, 70.5, 80.5

• 21, 31, 41, 51, 61, 71

• 30, 40, 50, 60, 70, 80

Find the relative frequencies

• 37%, 76%, 92%, 95%, 98%, 100%

• 28%, 30%, 12%, 2%, 2%, 2%

• 33%, 37%, 20%, 7%, 7%, 7%

• 37%, 39%, 16%, 3%, 3%, 3%

Find the cumulative frequencies.

• 28, 56, 84, 100

• 28, 58, 70, 72, 74, 76

• 33%, 37%, 20%, 7%, 7%, 7%

• 28, 30, 12, 2, 2, 2

Look at the frequency distribution. Find the class boundaries.

• 21, 31, 41, 51, 61, 70, 80

• 25.5, 35.5, 45.5, 55.5, 65.5, 75.5

• 20.5, 30.5, 40.5, 50.5, 60.5, 70.5

• 30, 40, 50, 60, 70, 80

Complete the definition:

• class boundaries

• lower class limits

• upper lass limits

• midpoints

Which of the following is the correct formula to find class width?

• (max-min)/(# of classes), round up to the next integer

• (max-min)/2, round up to the next integer

• (max-min)/(# of classes), round normally

• (max+min)/2, round normally

• (max-min)/(number of data), round up to the next integer

What would be the cumulative frequency for the third class?

• 5

• 12

• 17

• 18

A type of bar graph used to display numerical data that has been organized into equal intervals.

• Line Plot

• Interval

• Frequency Table

• Histogram

The distance between the greatest number and the least number in a set of data.

• Mean 

• Median

• Range

• Mode

A table that shows classes or intervals of data entries with a count of the number of entries in each class. 

• Frequency distribution

• Frequency polygon

• Histogram

• Ogive