Question

What is class marks of the class interview 122-125

Answer 1

Answer:

THE CLASS MARK IS 3...........

Answer 2

SOLUTION

TO DETERMINE

The class mark of the class interval 122 - 125

CLASS INTERVAL

When the number of sample values are large in number and are in wide range, then the whole data is divided in a number of several groups according to the size of the sample. Each of these groups, made as above, is known as class interval

CLASS LENGTH

Length of the class interval of an class is defined to be the difference between the lower and upper class boundaries ( not class limits) of that particular class interval.

Class length = Upper Class boundary - Lower class boundary

CLASS FREQUENCY

The number of observed values falling within a class is called the frequency of that class

CLASS MARK

For any grouped frequency table with class intervals, the middle value of the class limits or the class boundaries of any class is called class mark of the class

EVALUATION

Here the given class interval is 122 - 125

So the required class mark of the class interval 122 - 125 is

$\displaystyle \sf{ = \frac{122 + 125}{2} }$

$\displaystyle \sf{ = \frac{247}{2} }$

$= 123.5$

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