The class size of a distribution is 25 and the first class-interval is $200-224$. There are seven class-intervals.
Write the class-marks of each interval.

Given:

The class size of the distribution is 25 and the first class interval is $200-224$. There are seven class intervals.

To do:

We have to write the class-marks of each interval.

Solution:

Class size $= 25$

The first class is $200-224$
Therefore,

The class intervals are $200-224, 225-249, 250-274, 275-299, 300-324, 325-349, 350-374$. 

Class mark of $200-224=\frac{200+224}{2}$

$=\frac{424}{2}$

$=212$

Class mark of $225-249=\frac{225+249}{2}$

$=\frac{474}{2}$

$=237$

Class mark of $250-274=\frac{250+274}{2}$

$=\frac{524}{2}$

$=262$

Class mark of $275-299=\frac{275+299}{2}$

$=\frac{574}{2}$

$=287$

Class mark of $300-324=\frac{30,0+324}{2}$

$=\frac{624}{2}$

$=312$

Class mark of $325-349 =\frac{325+349}{2}$

$=\frac{674}{2}$

$=337$

Class mark of $350-374=\frac{350+374}{2}$

$=\frac{724}{2}$

$=362$

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Updated on: 10-Oct-2022

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