3. The less than cumulative frequencies of 7 th and 8th observations are 32 and B4 respectively. Identify the frequency of 8th observation (1)
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Answer:
I tHiNk iM loSiNg My MiND
Answered by
0
Answer:
Median class =125–145
Frequency of median class (f)=20
Cumulative frequency of the class preceding to the median class (cf)=22
Median =137
Class size (h)=145–125=20
Lower Limit of median class (l)=125
⇒ Median=l+
f
2
n
−cf
×h
⇒ 137=125+
20
2
n
−22
×20
⇒ 137−125=
2
n−44
⇒ 12=
2
n−44
⇒ 24=n−44
⇒ n=68
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