Question

A grouped frequency table with class intervals of equal sizes using $250-270$ ($270$ not included in this interval) as one of the class interval is constructed for the following data :$268,220,368,258,242,310,272,342,310,290,300,320,319,304,402,318,406,292,354,278,210,240,330,316,406,215,258,236$. The frequency of the class$310-330$ is:

• A. $4$
• B. $5$
• C. $6$
• D. $7$

Answer 1

The correct option is C

$6$

On tabulating the given data, we form the table as shown below;

Class Interval	Frequency
$210-230$	$3$
$230-250$	$3$
$250-270$	$3$
$270-290$	$2$
$290-310$	$4$
$310-330$	$6$
$330-350$	$2$
$350-370$	$2$
$370-390$	$0$
$390-410$	$3$

From the above table,

The frequency of the class $310-330$ is $6$.