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Question

The median for the following data is 1,100. Find the value of P.
X
100−200
200−300
300−400
F
10
P
16

A
1
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B
2
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C
3
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D
4
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Solution

The correct option is A 1
X
Frequencies(f)
Cumulative frequency(cf)
100200
10
10
200300
P
10+P
300400
16
26+P

n=Σf=26+P
n2=26+P2

Median =l+⎜ ⎜n2cff⎟ ⎟×h
n=Σf= Total number of frequency =26+P
n2=26+P2
So, the median class is 200300
L= Lower limit of the median class =200
cf= Cumulative frequency of the class preceding the median class =10
f= Frequency of the median class =P
h= class width=100
Therefore, Median =l+⎜ ⎜n2cff⎟ ⎟×h
1,100=200+⎜ ⎜ ⎜26+P210P⎟ ⎟ ⎟×100
1,100=200+(6+p2p)×100
1,100=400p+600+100p
1,100600=500p
P=500/500
P=1

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