Q4 of 35 Page 371

Find the mean and variance for each of the data in Exercise.

Presenting the data in the tabular form, we get



We know that Mean,


Where N =


∴


We know that Variance, σ2 =


∴ σ2 = (1/40) × 1736 = 43.4


Ans. Mean = 19 and Variance = 43.4


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