Question

Find the arithmetic mean of the following data
Cost of a pen (in rupees ) 30 ,35 ,20 ,10
Number of pens 1 , 2 ,3 ,4,5​

Answer 1

Answer:

5

Step-by-step explanation:

Answer 2

Step-by-step explanation:

Arithmetic Mean = Sum of all observations(items)/ Total Observations

So part 1 = 30+35+20+10/4 ; 95/4 = 23.7

Part 2 = 1+2+3+4+5/5 = 15/5 = 3

Additional Information..........

In case there are multiple/duplicate copies of our items.

So Multiply items with their frequency first.

Let's suppose there are 5 pens with cost 30,35,20,10,40

And Number of copies of those Pens are 1,2,3,4,5

So if we have to calculate Mean in this case the

In our case 30×1 , 35×2 , 20×3, 10×4, 40×5

(30×1)+ (35×2) + (20×3) + (10×4) +(40×5) / 5+4+3+2+1

General formula in this case is

Item1× Frequency+ Item2×Frequency..../Sum of all Frequencies