Q6 of 55 Page 340

Mohidul has written ages of 100 patients of village hospital. Let us write by calculating average age of 100 patients. [using any method]

We need to find the average using any method of calculation.

For the data given, the average can be calculated using direct method as the data is small. Using direct method for the given answer will provide us easier and faster calculation.


Let’s create a table showing frequencies and fixi.



So, we have


∑fixi = 4340


∑fi = 100


Using the direct method, we have the formula for arithmetic mean.



Using the above values, we get



⇒ Mean = 43.4


Thus, average is 43.4.

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If the arithmetic mean of the distribution given below is 15, let us find the value of p.

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Rahamatchacha will go to retail market, for selling mangoes kept in 50 packing boxes. Let us write the number of boxes contained varing number of mangoes in the table given below.


Let us write the mean number of mangoes kept in 50 packing boxes. [using any method]

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Let us find the mean of the following data by direct method.

 7

Let us find the mean of the following data by direct method.