Question

In a frequency distribution, then mid value of a class intervals is 5 and the width of the class interval is 6 the lower limt of the class-interval is

• A. 2
• B. 3
• C. 4
• D. 6

Answer 1

The correct option is A 2

Let the lower limit of the class interval is $l$ and the upper limit is $u$

Mid-value of the class interval is $5$

$\frac{l+u}{2}=5$

$l+u=10$ ................. (1)

Width of the interval is $6$

$u-l=6$ ................... (2)

Subtract equation (2) from (1),

$2l=4$

$l=2$