Prepare a frequency table using a class interval 100-199 and obtain th – InterviewSolution

1.	Prepare a frequency table using a class interval 100-199 and obtain the arithmetic mean. Pls answer the question in English
Answer» AnswerClassInterval Frequency (f) CUMULATIVE frequency (CF)10−20 12 1220−30 30 12+30=4230−40 a 42+a=42+a40−50 65 42+a+65=107+a50−60 b 107+a+b=107+a+b60−70 25 107+a+b+25=132+a+b70−80 18 132+a+b+18=150+a+bHere n=230150+a+b=230∴a+b=80As n=230, 2n =115This observation lies in the class 40-50.So, the median class is 40-50.∴l=40, 2n =115,cf=42+a,f=65 and c=10.

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