$\frac{\text{Upper class limit + Lower class limit}}{2}$
A
class size
✓
Class mark
C
Frequency
D
None of these
✓
Answer
Correct option: B.
Class mark
In each class interval of grouped data, there are two limits or boundaries $($upper limit and lower limit$)$ while the mid $-$ value is equal to $\frac{\text{Upper class limit+Lower class limit}}{2}.$
These mid $-$ values are also known as Class mark.
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