Question

How to find f2 when modal class frequency (f) is in the last column?

Answer 1

Answer:

The mode of a list of data values is simply the most common value (or values … if any). When data is grouped (binned) as in a histogram, we normally talk only about the modal class (the class, or group, with the greatest frequency), because we don’t know the individual values. But some sources teach a formula for finding (actually just estimating) the mode. We’ve had a number of questions about that formula.

We can easily find the modal group (the group with the highest frequency), which is 61 – 65.

We can say “the modal group is 61 – 65″.

But the actual Mode may not even be in that group! Or there may be more than one mode. Without the raw data we don’t really know.

But, we can estimate the Mode using the following formula:.

where:

L is the lower class boundary of the modal group

fm-1 is the frequency of the group before the modal group

fm is the frequency of the modal group

fm+1 is the frequency of the group after the modal group

w is the group width