Question

. Calculate the mean of first 20 even numbers
' Tell whether the 11
f.11.​

Answer 1

Step-by-step explanation:

✵ Question :-

Calculate the mean of first 20 even numbers

✵ Solution :-

First 20 even numbers are as follows :-

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38 and 40

Formula to calculate mean :-

${\large{\sf{\purple{Mean \: \: = \: \: \frac{sum \: of \: given \: digits}{Number \: of \: digits}}}}}$

${\bold{\sf{⟼ \: \: \: Mean \: = \: \frac{2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20 + 22 + 24 + 26 + 28 + 30 + 32 + 34 + 36 + 38 + 40}{20}}}}$

${\bold{\sf{⟼ \: \: \: Mean \: = \: \frac{420}{20}}}}$

${\bold{\sf{⟼ \: \: \: Mean \: = \: 21}}}$

Answer 2

Given :-

First Twenty even natural numbers .

To Find :-

The Mean of the given .

Used Concepts :-

• Mean = Sum of all observations/Total no. of observations .

Solution :-

First , let us write the first 20 natural numbers i.e :-

2 , 4 , 6 , 8 , 10 , 12 , 14 , 16 , 18 , 20 , 22 , 24 , 26 , 28 , 30 , 32 , 34 , 36 , 38 , 40

Here , Number of observations = 20

Sum of observations = 2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20 + 22 + 24 + 26 + 28 + 30 + 32 + 34 + 36 + 38 + 40

=> 420

So,. Mean = Sum of all observations/Total no. of all observations

=> 420/20

=> 21

Henceforth , The Required Answer is 21.

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