Q6 of 71 Page 199

In a school, the numbers of books issued to the students on 10 different days are as follows—

300, 405, 455, 489, 375, 280, 418, 502, 300, 476.


Find the mean number of books issued every day.

We know that,


Where, = Mean, xi = observations and n = no. of observations.



⇒ = 400


∴ mean number of books = 400


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