Ages of visitors who are allowed to visit in the hospital.
Class interval
46-50
41-45
36-40
31-35
26-30
21-25
Frequency( f)
8
9
15
6
5
2
Class Mark
fx
Lower boundary
< cf
Class interval
46-50
41-45
36-40
31-35
26-30
21-25
Frequency( f)
8
9
15
6
5
2
Class Mark
fx
Lower boundary
< cf
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Answer:
class mark LB
45 45.5
37 40.5
28 35.5
13 30.5
7 25.5
2 20.5