Question

For a grouped frequency distribution having eight class. The upper class boundaries of lowest and highest class are 10 and 66 respectively. What is the lower class boundaries of the highest class?
A.57
B.60
C.58
D.69​

Answer 1

Answer:

Class Interval 30-3435-39 40-44 45-49 50-54 55-59  Frequency 710 12 13 8 4 

a) class limit of fourth class is :- 45−49 are

45(lower limit) & 49 (upper limit)

b) class boundaries of sixth class is :- 55−54=1

=21=0.5

54+0.5=54.5

c) class mark of third class :- 40−44

=240+44=284=42

d) upper & lower limit of fifth class :- 50−54

upper limit = 54

lower limit - 50

e) size of the third class :- 40−44

difference between lower & upper limit

(44−40)=4