Draw grouped frequency tables, Mathematics

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Q. Draw Grouped Frequency Tables?

Ans.

Grouped frequency tables are often used when there are many different values. In these tables, the values are grouped into classes that contain a range of values.

Example: Here is a list of marks that Ms. Henry's students received on their last test. Make a grouped frequency table and estimate the mean mark received on the test.

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To estimate the mean of the test scores, first find the mean of each class, or midpoint value. Then multiply the class mean by its frequency.

115_Draw Grouped Frequency Tables1.png

The approximate mean is given by the sum of the products divided by the total number of student scores.

A reasonable estimate of the mean score of these students is 62.2.


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