Median for data with multiple-observation values

Date: 2015-10-07; view: 491.

For an ungrouped frequency distribution, find the median by examining the cumulative frequency to locate the middle value, as shown in the next example.

Example:

The number of videocassette recorders sold per month over a two-year period is recorded below. Find the median.

Solution:

As we know the median is observation.

Since then .

To find and observations we write corresponding cumulative frequency distribution (Table 1.4).

Table1.4

The and values fall in class 3.

value=3 ; value=3.

Therefore, .