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Question

Find the mean age in years from the frequency distribution given below:
Class interval of age in yearsFrequency(fi)25294303414353922404416454965054555593Total70


A
39.36
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B
35.39
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C
40.15
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D
40.39
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Solution

The correct option is A 39.36

Class mark for first class interval =Upper class limit + Lower class limit2=25+292=27
Similarly the class mark for each class interval can be found.
Class intervalFrequency(fi)Class mark(xi)fixi2529427108303514324483539223781440451642672454964728250555522605559357171Totalfi=70fixi=2755Mean=fixifi=275570=39.36


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