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

Answer: (C)

$6$

Numbers between $310$ and $330$ are $310,310,320,319,318,316.330$ will not be included in this interval. Thus, frequency is $6$.