# RS Aggarwal Solutions Class 9 Mathematics Solutions for Mean Median And Mode Of Ungrouped Data Exercise 18A in Chapter 18 - Mean Median And Mode Of Ungrouped Data

Question 3 Mean Median And Mode Of Ungrouped Data Exercise 18A

The following are the numbers of books issued in a school library during a week:

105, 216, 322, 167, 273, 405 and 346.

Find the average number of books issued per day.

It is given that the number of books issued are 105, 216, 322, 167, 273, 405 and 346.

We know that

Mean = sum of numbers/ total numbers

By substituting the values

Mean = (105 + 216 + 322 + 167 + 273 + 405 + 346)/ 7

On further calculation

Mean = 1834/7

By division

Mean = 262

Therefore, the average number of books issued per day is 262.

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