Question
The median for the data is
IQ 60−7070−8080−9090−100100−110110−120120−130No. of pupils2351614137
IQ 60−7070−8080−9090−100100−110110−120120−130No. of pupils2351614137
Answer: Option A
:
A
ClassIntervalFrequencyCumulativeFrequency60−702270−803580−9051090−1001626100−1101440110−1201353120−130760
n2=30.
So, the median class is the one whose cumulative frequency is closest to and greater than 30.
∴ the median class is 100-110
Median=l+(n2−cff)×h
Where l is lower class limit of median class.
n is total number of observations.
cf is the cumulative frequency of the class preceding the median class.
f is the frequency of the median class and h is the class size.
⟹Median=100+30−2614×10
∴Median=102.86
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:
A
ClassIntervalFrequencyCumulativeFrequency60−702270−803580−9051090−1001626100−1101440110−1201353120−130760
n2=30.
So, the median class is the one whose cumulative frequency is closest to and greater than 30.
∴ the median class is 100-110
Median=l+(n2−cff)×h
Where l is lower class limit of median class.
n is total number of observations.
cf is the cumulative frequency of the class preceding the median class.
f is the frequency of the median class and h is the class size.
⟹Median=100+30−2614×10
∴Median=102.86
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