Q1 of 55 Page 340

I have written ages of my 40 friends in the table given below.


Let us find average age of my friends by direct method.

The arithmetic mean is important in statistics. It is also called average or average value, is the quantity obtained by summing two or more numbers or variables and then dividing with the number of numbers or variables.

Direct method of finding the arithmetic mean is the easiest.


We have been given frequency distribution table, let’s make it again.



By direct method, arithmetic mean (AM) is given by



⇒


⇒ AM = 17.425


Thus, average age of his/her friends is 17.4.


More from this chapter

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2

I have written member of 50 families of our village in the table given below.


Let us write the average member of 50 families by the method of assumed mean.

 3

If the arithmetic mean of the data given below is 20.6, let us find the value of ‘a’

 4

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

 5

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]