Question

If the class marks in frequency distribution are 19.5, 26.5, 33.5, 40.5, then find the class corresponding to the class mark 33.5. ​

Answer 1

Step-by-step explanation:

Class mark is the mid point of the class interval.

Class size is the upper limit minus lower limit.

Given that class mark of a class is 6.5 and

the class size is 26.5−19.5=33.5−26.5=40.5−33.5=7

By option verification,

Opition A class mark is

2

16+23

=

2

39

=19.5 False

Option B class mark is

2

30+23

=

2

53

=26.5 False

Option C class mark is

2

30+37

=

2

67

=33.5 and

class size is 37−30=7 True

Option D class mark is

2

37+41

=

2

78

=39 False

Therefore the class interval is 30−37