Adjusted Class Mark =

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Number of classes class interval

(Adjusted Upper class limit + Adjusted Lower class limit)/2

(Upper class limit+ Lower class limit)/2

None

answer is B.

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Detailed Solution

Class limits are also known as class Interval or Class Mark. Upper class limit and Lower class Limit are the two components in it. Lower class limit is the smallest data value and Upper class limit is the largest data value.
In general, in corresponding classes, if the upper limit of one class is equal to the lower limit of the next class then the class limit is maintained and balanced and requires no adjustment in class limit.
For, example 10-15, 15-20, 20-25,--
But, when the class intervals are discontinuous, we need to adjust the interval.
Adjusted Class Limit is given be,
Adjusted Class Limit =

\frac{Adjusted Upper Class Limit + Adjusted Lower Class Limit}{2}

For example if we have class interval as 10-13, 17-20, 24-27,--
We can see that the difference between the upper limit of any class and the lower limit of the next class is 4.
So, Adjusted Class Limit =