MCQ
Class mark of a particular class is $9.5$ and the class size is $6$, then the class interval is:
- ✓$6.5 - 12.5$
- B$15.5 - 27.5$
- C$3.5 - 15.5$
- D$12.5 - 18.5$
✓
Answer
Correct option: A.
$6.5 - 12.5$
Class mark $=\frac{\text{upper limit+lower limit}}{2}$
$2 \times 9.5$ = upper limit + lower limit
$19$ = upper limit + lower limit
Class size = upper limit - lower limit
$6$ = upper limit - lower limit
Solving above two equations we get,
$2 \times $ upper limit $= 25$
upper limit $= 12.5$
Hence, lower lower limit $= 12.5 - 6 = 6.5$
So, the class interval is$ 6.5 - 12.5$.
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