Question

The class mark of the 90-150 is
a)120
b)30
c)60
d)110​

Answer 1

SOLUTION

TO CHOOSE THE CORRECT OPTION

The class mark of the 90 - 150 is

a) 120

b) 30

c) 60

d) 110

CONCEPT TO BE IMPLEMENTED

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 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 90 - 150

Upper Class boundary = 150

Lower class boundary = 90

So the required class mark of the class interval 90 - 150 is

$\displaystyle \sf{ = \frac{90 + 150}{2} }$

$\displaystyle \sf{ = \frac{240}{2} }$

= 120

FINAL ANSWER

Hence the correct option is a) 120

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