Q. 3

Draw a less than type cumulative frequency curve for the following data and from the graph find the median:

Answer :

Now, taking upper class limits on x- axis and their respective frequencies on y-axis we can draw its ogive as follows:

Now, we have n = 250

The cumulative Frequency just greater than is 140 then the median class is 300-400 such that

the lower limit (l) = 300

cumulative frequency of the class preceding 300-400 (cf) = 75

frequency of the median class 300-400 = 65,

class size (h) = 100

Using the formula,,we have

= 300 +76.9

= 376.9

=377 (approx.)

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