Find the value of (x - y) + z.
Class Interval 0-20 20-40 40-60 60-80 80-100 100-120 120-140
Frequency 6 8 10 12 y 5 3
C.F. x 14 24 36 42 47 z
Answers
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Step-by-step explanation:
ClassInterval Frequency c.f.
0−20 6 6
20−40 8 14
40−60 10 24
60−80 12 36
80−100 6 42
100−120 5 47
120−140 3 50
N=50
Here, N=50, then
2
N
=
2
50
=25
∴ Median class =60−80
We have, l=60,c.f=24,f=12 and h=20
Median=l+
f
2
N
−c.f
×h
=60+
12
25−24
×20
=60+1.66
=61.66
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