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Question

Find the mean age in years from the frequency distribution given below:
Class interval of age in yearsFrequency(fi)25−30430−351435−402240−451645−50650−55555−603Total70


A

39.85

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B

39.40

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C

40.15

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D

40.39

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Solution

The correct option is A

39.85


Class mark for first class interval =Upper class limit + Lower class limit2=25+302=27.5
Similarly the class mark for each class interval can be found.
Class intervalFrequency(fi)Class mark(xi)fixi2530427.511030351432.545535402237.582540451642.56804550647.52855055552.5262.55560357.5172.5Totalfi=70fixi=2790Mean=fixifi=279070=39.85


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