Q7 of 35 Page 371

Find the mean and variance for the following frequency distributions in Exercises.


Presenting the data in the tabular form, we get


We know that Mean,


Where N =


∴


We know that Variance, σ2 =


∴ σ2 = (1/30) × 68280 =2276


Ans. Mean = 107 and Variance = 2276


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